OFFSHORE LOGISTICS INC
SC 13D, 1997-04-23
AIR TRANSPORTATION, NONSCHEDULED
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                  SCHEDULE 13D

                 UNDER THE SECURITIES AND EXCHANGE ACT OF 1934
                              (AMENDMENT NO. ___)*


                            OFFSHORE LOGISTICS, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                         Common Stock ($.01 par value)
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   676255 102
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                             Mr. Graeme P. Denison
                           Caledonia Investments plc
                                  Cayzer House
                              1 Thomas More Street
                                 London E1 9AR
                                44-0171-481-4343
- --------------------------------------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                               December 19, 1996
- --------------------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b) (3) or (4), check the following box [__].

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange of 1934
("Act") or otherwise subject to the liabilities of that section of the Act but
shall be subject to all other provisions of the Act (however, see the Notes).

                              Page 1 of 11 Pages
<PAGE>
 
                                 SCHEDULE 13D


- -----------------------                                  ---------------------
  CUSIP NO. 676255 102                                     PAGE 2 OF 11 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      Caledonia Industrial & Services Limited

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
      00

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                             [_]   
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      England

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            0 
                          
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          
     OWNED BY             1,628,083*
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             0
                          
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          1,628,083*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      1,628,083*
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                                                                    [_]  
      (See Instructions)
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.7%
      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON (See instructions)
14
      CO
      
- ------------------------------------------------------------------------------
                     SEE INSTRUCTIONS BEFORE FILLING OUT!
        INCLUDING BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

____________________
        * Includes 328,083 shares of Common Stock that the Reporting Person has
a right to acquire upon conversion of $7,500,000 of Convertible Subordinated
Notes due 2003 (the "Notes") of the Issuer at an assumed conversion price of
$22.86 per share.
<PAGE>
 
                                 SCHEDULE 13D


- -----------------------                                  ---------------------
  CUSIP NO. 676255 102                                     PAGE 3 OF 11 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      Caledonia Investments plc

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS (See instructions)
 4
      Not Applicable

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                            [_]    
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      England

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            0
                          
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          1,628,083**
     OWNED BY             
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             -0-
                          
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          1,628,083*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      1,628,083*
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                                                                   [_]
      (See Instructions)
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.7%
      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
      
- ------------------------------------------------------------------------------
                     SEE INSTRUCTIONS BEFORE FILLING OUT!
        INCLUDING BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

_____________________
        ** Includes 328,083 shares of Common Stock that the Reporting Person has
a right to acquire upon conversion of $7,500,000 of Convertible Subordinated
Notes due 2003 (the "Notes") of the Issuer at an assumed conversion price of
$22.86 per share.
        
<PAGE>
 
                                 SCHEDULE 13D


- -----------------------                                  ---------------------
  CUSIP NO. 676255 102                                     PAGE 4 OF 11 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      The Cayzer Trust Company Limited

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
      

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
      Not Applicable

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                             [_]   
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      England

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            0                 
                                
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          1,628,083***
     OWNED BY             
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             -0-
                          
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          1,628,083*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      1,628,083*
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                                                                  [_]    
      (See Instructions)
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.7%
      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
      
- ------------------------------------------------------------------------------
                     SEE INSTRUCTIONS BEFORE FILLING OUT!
        INCLUDING BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

_______________________
        ***Includes 328,083 shares of Common Stock that the Reporting Person has
a right to acquire upon conversion of $7,500,000 of Convertible Subordinated
Notes due 2003 (the "Notes") of the Issuer at an assumed conversion price of
$22.86 per share.
        
<PAGE>
 
                                 SCHEDULE 13D


- -----------------------                                  ---------------------
  CUSIP NO. 676255 102                                     PAGE 5 OF 11 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
      Sterling Industries PLC
 
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- -------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
      Not Applicable

- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5    ITEMS 2(d) OR 2(e)                                             [_]   
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6    
      England

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7     
     NUMBER OF            0
                          
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8    
                          1,628,083****
     OWNED BY             
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9     
    REPORTING             -0-
                          
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH         10    
                          1,628,083*
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11    
      1,628,083*
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES
12                                                                  [_]
      (See Instructions)
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13    
      7.7%
      
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      CO
      
- ------------------------------------------------------------------------------
                     SEE INSTRUCTIONS BEFORE FILLING OUT!
        INCLUDING BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

_________________
        ****Includes 328,083 shares of Common Stock that the Reporting Person 
has a right to acquire upon conversion of $7,500,000 of Convertible Subordinated
Notes due 2003 (the "Notes") of the Issuer at an assumed conversion price of 
$22.86 per share.
<PAGE>
 
                                 SCHEDULE 13D

                                   UNDER THE

                        SECURITIES EXCHANGE ACT OF 1934


ITEM 1.   SECURITY AND ISSUER.

     This Statement relates to the Common Stock ($.01 par value) ("Common
Stock") of Offshore Logistics, Inc. (the "Issuer").  The principal executive
offices of the Issuer are located at 224 Rue De Jean, Lafayette, Louisiana
70508.


ITEM 2.   IDENTITY AND BACKGROUND.

     The persons filing this Statement (the "Reporting Persons"), the persons
enumerated in Instruction C of Schedule 13D (the "Additional Persons") and,
where applicable, their respective places of organization, directors, executive
officers and controlling persons, and the information in respect of such
persons, are as follows:

     (a) This Statement is filed by (i) Caledonia Industrial & Services Limited
("CIS") as the direct beneficial owner of the Common Stock; (ii) by virtue of
its direct holding of all of the outstanding stock of CIS, by Caledonia
Investments plc ("Caledonia"); (iii) by virtue of their respective direct
holdings of the securities of Caledonia and their consequent indirect holdings
of the stock of CIS, by The Cayzer Trust Company Ltd. ("Cayzer Trust") and
Sterling Industries PLC ("Sterling") (collectively, the "Reporting Persons").

     CIS is the registered and direct beneficial holder of approximately 7.7% of
the outstanding common stock of the Issuer.  Caledonia is the holder of all of
the outstanding common stock of CIS.  Cayzer Trust holds 27.1% of the
outstanding common stock of Caledonia and 44.9% of the outstanding common stock
of Sterling.  Sterling holds 9.7% of the outstanding common stock of Caledonia.
CIS, in turn, holds 27.2% of the outstanding common stock of Sterling.
Together, Cayzer Trust and Sterling may be deemed to control Caledonia and,
hence, CIS.  Cayzer Trust and Sterling disclaim beneficial ownership of
Caledonia or  CIS.

     (b) The principal business address of each Reporting Person (other than
Sterling) is Cayzer House, 1 Thomas More Street, London, England E1 9AR.  The
principal business address of Sterling is Sterling House, Crewkerne, Somerset,
England TA18 8LL.  The addresses of the officers and directors of the Reporting
Persons are set forth on Schedule A hereto and incorporated herein by reference.

     CIS is an investment holding company.

     Caledonia is a diversified trading and investment company.

     Cayzer Trust is an investment holding company.

     Sterling is an engineering company.

     (c) Certain additional information about the officers and directors of the
Reporting Persons is set forth on Schedule A hereto and incorporated herein by
reference.

     (d) During the last five years, neither any Reporting Person nor, to any
Reporting Person's knowledge, any of the Additional Persons, have been convicted
in a criminal proceeding (excluding traffic violations or similar misdemeanors).

     (e) During the last five years, neither any Reporting Person nor to any
Reporting Persons' knowledge, any of the Additional Persons, were a party to a
civil proceeding of a judicial or administrative body of competent jurisdiction
and as a result of such proceeding was or is subject to a judgment, decree or
final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or laws or finding any violation with respect to
such laws.

                                 Page 6 of 11
<PAGE>
 
     (f) Each Reporting Person is a corporation organized under the laws of
England.  Each of the Additional Persons is a citizen of Great Britain.


ITEM 3.   SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

     All the Common Stock was acquired by CIS directly from the Issuer on
December 19, 1996 in exchange solely for common stock of Bristow Helicopter
Group Limited.  None of the Common Stock was purchased with cash funds.


ITEM 4.   PURPOSE OF TRANSACTION.

     The purpose of the acquisition of the Common Stock by CIS is to acquire an
equity interest in the Issuer for investment purposes.  Any Reporting Person
may, from time to time, increase, reduce or dispose of its investment in the
Issuer, depending on general economic conditions, economic conditions in the
markets in which the Issuer operates, the market price of the Common Stock of
the Issuer, the availability of funds, borrowing costs, other opportunities
available to the Reporting Person, the strategic value of the investment to the
Reporting Person and other considerations.


ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.

     (a) CIS is the direct beneficial owner of the following shares of Common
Stock:

                                   1,628,083*

     This holding represents 7.7% of the total of 21,080,989, the amount
currently outstanding according to records of the Issuer, plus the additional
328,083 shares that would be outstanding following issuance upon conversion of
the Notes (as below defined).  By virtue of the relationships described in Item
2, the other Reporting Persons may be deemed to share indirect beneficial
ownership of the shares of Common Stock owned directly by CIS.  Cayzer and
Sterling disclaim all such beneficial ownership.

          *Includes 328,083 shares of Common Stock that the Reporting Person has
          a right to acquire upon conversion of $7,500,000 of Convertible
          Subordinated Notes due 2003 (the "Notes") of the Issuer at an assumed
          conversion price of $22.86 per share.


     (b) CIS has the direct power to vote and direct the disposition of the
shares of Common Stock owned by it.

     (c) There have been no transactions in shares of common stock by any
Reporting Person.

     (d) CIS has the right to receive and the power to direct receipt of
dividends from the sale of, shares of Common Stock held by it.

     (e)  Not applicable.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
     TO SECURITIES OF THE ISSUER.

     Under a Master Agreement dated December 12, 1996 among the Issuer, CIS,
Caledonia and certain other persons (the "Master Agreement") with respect to the
Common Stock,

     So long as CIS owns (1) at least 1,000,000 shares of common stock of the
     Issuer or (2) at least 49% of the total outstanding ordinary shares of
     Bristow Aviation Holdings Limited, CIS will have the right to nominate two
     individuals to the board of directors of the Issuer and to replace any such
     directors so nominated.

                                 Page 7 of 11
<PAGE>
 
ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

     Exhibit 1 The Master Agreement dated December 12, 1996 is incorporated by
     reference to Exhibit to a Current Report on Form 8-K filed by Issuer with
     The Securities and Exchange Commission on January 3, 1997.

     Exhibit 2 Supplemental Letter Agreement dated December 19, 1996 to the
     Master Agreement.

                                   SIGNATURE



     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this Statement is true, complete and
correct.

April 22nd, 1997              CALEDONIA INDUSTRIAL & SERVICES LIMITED


                              By: /s/ G. P. DENISON
                                  _____________________________________________

                              Name: G. P. DENISON
                                    ___________________________________________

                              Title: COMPANY SECRETARY
                                     __________________________________________

April 22nd, 1997              CALEDONIA INVESTMENTS PLC


                              By: /s/ G. P. DENISON 
                                  _____________________________________________

                              Name: G. P. DENISON
                                    ___________________________________________

                              Title: COMPANY SECRETARY
                                     __________________________________________


April 22nd, 1997              THE CAYZER TRUST COMPANY LIMITED


                              By: /s/ J. I. MEHRTENS
                                  _____________________________________________

                              Name: J. I. MEHRTENS
                                    ___________________________________________

                              Title: DIRECTOR
                                     __________________________________________


April 22nd, 1997              STERLING INDUSTRIES PLC


                              By: /s/ J. H. CARTWRIGHT
                                  _____________________________________________

                              Name: J. H. CARTWRIGHT
                                    ___________________________________________

                              Title: DIRECTOR
                                     __________________________________________


                                 8 of 11 Pages
<PAGE>
 
                                   SCHEDULE A
                                TO SCHEDULE 13D



(i)  DIRECTORS AND EXECUTIVE OFFICERS OF CALEDONIA INDUSTRIAL & SERVICES LIMITED

 
(A)  NAME           (B)  RESIDENCE       (C)  PRINCIPAL          (D) CITIZENSHIP
                                              OCCUPATION

P N Buckley          6 Albert Place       Chairman &                   British
                     London, W8 5PD       Chief Executive,
                     England              Caledonia Investments plc

J H Cartwright       Rectory Meadow       Finance Director,            British
                     Hawthorn Place       Caledonia Investments plc
                     Penn,
                     Buckinghamshire
                     HP10 8EH, England

Hon C W Cayzer       Finstock Manor       Executive                    British
                     Finstock             Director,
                     Oxfordshire, OX73DG  Caledonia Investments plc
                     England

G P Denison          16 Highfield Road    Company                      British
                     Hertford             Secretary,
                     Hertfordshire        Caledonia Investments plc
                     SG13 8BH
                     England

Sir David Kinloch    29 Walpole Street    Deputy Chief                 British
                     London, SW3 4QS      Executive,
                     England              Caledonia Investments plc

M G Wyatt            Pippin Park          Deputy                       British
                     Lidgate, Newmarket   Chairman,
                     Suffolk, CB8 9PP     Caledonia Investments plc
                     England


(ii) DIRECTORS AND OFFICERS OF THE CAYZER TRUST COMPANY LIMITED

 
(A)  NAME         (B)  RESIDENCE          (C)  PRINCIPAL        (D)  CITIZENSHIP
                                               OCCUPATION

G A Adkin         Marsh Farm Cottage          Retired                  British
                  Mapperton, Beaminster
                  Dorset DT8 3NP, England

P N Buckley                                   (see above)

Lord Cayzer       The Grove                   President                British
                  Walsham-le-Willows          Caledonia Investments 
                  Suffolk, England            plc 

Hon C W Cayzer                                (see above)



                                 Page 9 of 11
<PAGE>
 
(A)  NAME       (B)  RESIDENCE              (C)  PRINCIPAL        D) CITIZENSHIP
                                                OCCUPATION

Sir James         Kinpurnie Castle, Newtyle,     Landowner             British
 Cayzer           Angus, Scotland
 

The Hon.          Tangley House, Andover         None                  British
Mrs. N. Colvin    Hampshire SP11 OSH,
                  England

J I Mehrtens      51 Oxenden Wood Road,          Company Secretary of  British
                  Chelsfield Park,               The Cayzer Trust
                  Orpington,                     Company Limited
                  Kent BR6 6HP, England

M G Wyatt                                        (see above)

 
(iii)     DIRECTORS AND EXECUTIVE OFFICERS OF CALEDONIA INVESTMENTS PLC:

 
(A)  NAME           (B)  RESIDENCE          (C)   PRINCIPAL      (D) CITIZENSHIP
                                                 OCCUPATION

P N Buckley                                 (see above)

J Burnett-Stuart    Ardmeallie House        Retired                    British
                    Huntley,
                    Aberdeenshire,
                    AB54 5RS, Scotland

J H Cartwright                              (see above)

Lord Cayzer                                 (see above)

N K Cayzer          Thriepley House         Chairman,                  British
                    Lundie, Dundee          Oriel Group plc
                    Scotland                145-149 Borough
                                            High Street
                                            London,
                                            SE1 1NP
                                            England

Hon C W                                     (see above)
 Cayzer

G P Denison                                 (see above)

Sir David                                   (see above)
 Kinloch

J R H Loudon        Olantigh                Finance Director,          British
                    Wye                     Blue Circle
                    Ashford                 Industries PLC
                    Kent, England TN25 5EW  84 Eccleston
                                            Square
                                            London,
                                            SW1V 1PX
                                            England

M G Wyatt                                   (see above)

 


                                 Page 10 of 11
<PAGE>
 
(iv) DIRECTORS AND OFFICERS OF STERLING INDUSTRIES PLC:
 
(A)  NAME         (B)  RESIDENCE              (C)  PRINCIPAL    (D)  CITIZENSHIP
                                                   OCCUPATION

D Blunn           The Barn, Park Farm,         Finance Director of     British
                  Marston Magna, Somerset      Sterling Industries PLC
                  TA22 8AX, England
 

P N Buckley                                    (see above)

J H Cartwright                                 (see above)

H W Denman        The Penthouse,               Retired                 British
                  Old Avenue,
                  St. Georges Hill, Weybridge
                  Surrey, KT13 0QB, England

D Diggins         Fairgarden, Unity Lane       Chief Executive of      British
                  Misterton, Crewkerne         Sterling Industries PLC
                  Somerset TA18 5NA,
                  England

Sir David                                      (see above)
 Kinloch

M G Wyatt                                      (see above)


                                 Page 11 of 11

<PAGE>
 
                                                                       EXHIBIT 2

                           OFFSHORE LOGISTICS, INC.
                                224 Rue de Jean
                          Lafayette, Louisiana 70505


                                                               December 19, 1996

                     Supplemental Letter Agreement to the
                 Master Agreement, made on December 12, 1996,
            among Caledonia Investments plc, Caledonia Industrial &
             Services Limited and the Other Parties Named Therein
                           (the "Master Agreement")


Caledonia Industrial & Services Limited
Cayzer House
1 Thomas More Street
London, E1 9AR
England

Gentlemen and Ladies:

        Reference is made to the captioned Master Agreement. Capitalized terms 
used herein and not otherwise herein defined shall have the meanings ascribed to
such terms in the Master Agreement.

        Each of CIS and OLOG wish to supplement the Master Agreement as provided
herein.

        1. Representations and warranties of OLOG. OLOG represents and warrants 
to CIS as follows:

                A. OLOG has been duly incorporated, is validly existing as a 
corporation and is in good standing under the laws of the State of Delaware.

                B. Each of this letter agreement, the Master Agreement and the 
Registration Rights Agreement, dated the date hereof, between OLOG and CIS (the 
"Registration Rights Agreement") has been duly authorized, executed and 
delivered by OLOG; and OLOG has full corporate power and authority necessary to 
enter into this letter agreement, the Master Agreement and the Registration 
Rights Agreement and to perform its obligations hereunder and thereunder.


<PAGE>
 
                C. The Rights Agreement, dated as of February 29, 1996 (the 
"Rights Agreement"), between OLOG and Chase Mellon Shareholder Services L.L.C. 
has been duly authorized, executed and delivered by OLOG, the Rights (as defined
in the Rights Agreement) to be issued upon issuance of the OLOG Common Stock to 
be issued under the Master Agreement and to be issued upon issuance of shares of
Common Stock ("Conversion Shares") of OLOG issuable upon conversion of any OLOG 
Loan Stock to be issued under the Master Agreement have been duly authorized and
the Series A Junior Participating Preferred Stock to be issued upon exercise of 
the Rights has been duly authorized. Upon issuance of the OLOG Common Stock to 
be issued under the Master Agreement and/or upon issuance of any Conversion 
Shares (including one Right for each such share of OLOG Common Stock and each 
such Conversion Share, as the case may be), CIS (and each of its transferees of 
any such shares of OLOG Common Stock or Conversion Shares) will have all rights 
and powers and be subject to all other terms, conditions and restrictions as are
available and applicable to a Rights holder under the Rights Agreement and no 
further action pursuant to the Rights Agreement on the part of OLOG or CIS is 
required to give effect to the foregoing.

                D. All corporate action required to be taken for the 
authorization, issuance and sale of the OLOG Common Stock to be issued under the
Master Agreement (including one Right for each such share of OLOG Common Stock) 
has been validly and sufficiently taken. The shares of OLOG Common Stock to be 
issued under the Master Agreement and the Rights appertaining thereto have been 
duly authorized for issuance and sale to CIS pursuant to the Master Agreement 
and, against payment of the consideration set forth therein, such shares of OLOG
Common Stock and such Rights will be validly issued, fully paid and 
nonassessable, and no holder thereof will be subject to personal liability 
solely by reason of being such a holder.

                E. The execution and delivery by OLOG of, and the full and 
timely performance by OLOG of its obligations under, each of this letter 
agreement, the Master Agreement and the Registration Rights Agreement, and the 
consummation of each of the transactions contemplated herein and therein:

                        1. have been duly authorized by all necessary corporate 
action on the part of OLOG;

                        2. do not and will not result in any violation of the 
certificate of incorporation or bylaws of OLOG; and

                        3. do not and will not conflict with, or result in a 
breach or violation of, any of the terms or provisions of, or constitute a 
default under (or an event which, with notice or lapse of time, or both, would 
constitute a default

                                       2
<PAGE>
 
under), or give rise to any right to accelerate the maturity or require the 
prepayment of any indebtedness under, or result in the creation or imposition of
any lien, charge or encumbrance upon any material property or assets of OLOG 
under;

                            a. any indenture, mortgage, loan agreement, note, 
lease, license, partnership agreement, franchise agreement or other agreement or
instrument to which OLOG is a party or by which it may be bound or affected or 
to which any of its properties or assets may be subject, other than any such 
conflict, breach, default, acceleration, prepayment, lien, charge, encumbrance 
that could not, individually or in the aggregate, reasonably be expected to 
result in a material adverse effect on the consolidated business or operations 
of OLOG;

                            b. any existing applicable law, rule or regulation; 
or

                            c. any judgment, order or decree of any government, 
governmental instrumentality or court, domestic or foreign, having jurisdiction 
over OLOG or any of its properties.

                F. The shares of OLOG Common Stock to be issued pursuant to the 
Master Agreement:

                        1. will not have been, individually and collectively, 
issued or sold in violation of any preemptive or other similar rights of the 
holders of any securities of OLOG; and

                        2. are listed on, and will be, following the completion 
of the Restricted Period (as defined below), eligible for trading on, the 
National Association of Securities Dealers Automated Quotations system 
("NASDAQ").

                G. OLOG is a reporting issuer and has filed all reports required
to be filed by Section 13(a) or 15(d) of the United States Securities and 
Exchange Act of 1934, as amended (the "Exchange Act") during the preceding 12 
months. None of such reports contains any untrue statement of a material fact or
omits to state any material fact necessary in order to make the statements 
contained therein not misleading.

                H. The issuance and sale of the shares of OLOG Common Stock 
pursuant to the Master Agreement will be made in accordance with the provisions 
and requirements of Regulations S ("Regulation S") under the United States 
Securities Act of 1933, as amended (the "Securities Act"), and any applicable 
state law.

                                       3
<PAGE>
 
            I.  No offer to buy the shares of OLOG Common Stock to be issued 
pursuant to the Master Agreement was made to OLOG by any person in the United 
States.

            J.  None of OLOG, any affiliate of OLOG, or any person acting on 
behalf of OLOG or any such affiliate has engaged, or will engage, in any 
Directed Selling Efforts (as such term is defined under Regulation S) with 
respect to the shares of OLOG Common Stock to be issued pursuant to the Master 
Agreement.

            K.  OLOG has not issued, and after the Completion Date will not 
issue, any stop transfer order or other order impeding the sale and delivery of 
the shares of OLOG Common Stock to be issued pursuant to the Master Agreement 
except for a stop order restricting the sale of such shares into the United 
States or to, or for the account or benefit of, U.S. Persons during the 
Restricted Period.  Notwithstanding the foregoing provision, OLOG may place the 
following legend on the certificate(s) representing the shares of OLOG Common 
Stock to be issued pursuant to the Master Agreement:

        The shares represented by this certificate have not been registered
        under the Securities Act of 1933, as amended (the "Act"), and have been
        sold in reliance on the exemption from registration provided by
        Regulation S under the Act ("Regulation S"). During the period prior to
        January 29, 1997 (the "Restricted Period"), the shares represented by
        this certificate may not be offered or sold, directly or indirectly,
        within the United States (as defined under Regulation S), to a U.S.
        Person (as defined under Regulation S) or for the account or benefit of
        a U.S. Person. The preceding sentence shall have no further effect
        subsequent to the expiration of the Restricted Period and thereafter
        this legend may be removed upon presentation of this certificate to the
        transfer agent for Offshore Logistics, Inc.

            L.  OLOG has not offered to sell or sold any warrants convertible 
into shares of its common stock in a transaction involving Regulation S in the 
past year; and there are no outstanding warrants convertible into shares of its 
common stock which have been sold in a transaction involving Regulation S.

            M.  OLOG hereby extends and makes to CIS, with respect to (i) the 
OLOG Loan Stock to be issued under the Master Agreement, (ii) each of the 
Conversion Shares and (iii) the Indenture, dated as of December 15, 1996 (the 
"Indenture") between OLOG and Fleet National Bank, as Trustee, the same 
representations and warranties as are made with respect thereto to the 
Purchasers (as such term is defined in the Purchase Agreement, dated December 
11, 1996 (the "Purchase Agreement"), among OLOG and Jefferies & Company, Inc., 
Simmons & Company

                                       4
<PAGE>
 
International and Johnson Rice & Company L.L.C.) under paragraph 1 of the 
Purchase Agreement

        2. Covenants of OLOG. OLOG covenants and agrees with CIS to:

                A. continue to comply with all applicable reporting requirements
of the Exchange Act;

                B. except for the sale of $87.5 million aggregate principal 
amount (subject to increase up to $98 million aggregate principal amount upon 
exercise of an overallotment option) of OLOG's 6% Convertible Subordinated Notes
due 2006 as contemplated by that certain Offering Circular, dated December 11, 
1996 (the "Offering Circular"), refrain from offering to sell or selling any 
shares of common stock, or warrants or other securities convertible into its 
common stock, in a transaction involving Regulation S for a period of 180 days 
following the Completion Date;

                C. ensure, to the extent such is within its control, that all 
Offering Restrictions (as such term is defined under Regulation S) applicable to
the sale of shares of OLOG Common Stock to be issued pursuant to the Master 
Agreement are thoroughly complied with and satisfied;

                D. refrain from engaging, and ensure, to the extent such is 
within its control, that none of its affiliates will engage, in any Directed 
Selling Efforts with respect to the shares of OLOG Common Stock to be issued 
pursuant to the Master Agreement;

                E. cause its Board of Directors to take action prior to the 
close of business on the Completion Date to cause the number of directors 
constituting the full Board of Directors of OLOG at the Completion Date to be 
increased to ten persons, and to elect Peter N. Buckley and Jonathan H. 
Cartwright to the Board of Directors of OLOG (such increase and such elections 
to be subject to the consummation of the transactions under the Master 
Agreement). If during the period that CIS is entitled to have two designees on 
the Board of Directors of OLOG, any CIS designated director shall decline or be 
unable to serve as a director of OLOG, the remaining CIS designated director 
shall designate another person to serve in such person's stead. If during such 
period, any OLOG designated director shall decline or be unable to serve as a 
director of OLOG, a majority of the remaining OLOG designated directors shall 
designate another person to serve in such person's stead. OLOG shall take all 
appropriate action during such period to assist in the nomination for election 
as directors of OLOG of the CIS designees named above (or any successor chosen 
pursuant to this subsection 2(E)). The provisions of this subsection 2(G) shall 
remain applicable,

                                       5
<PAGE>
 
and CIS shall be entitled under this subsection 2(E) to have two of its 
designees on the Board of Directors of OLOG, for so long as either (i) CIS shall
own at least 1,000,000 shares of OLOG Common Stock or (ii) CIS shall own at 
least 49% of the total outstanding ordinary shares of Newco.

                OLOG shall promptly pay all reasonably out-of-pocket costs and 
expenses incurred by each of the CIS designees serving as directors of OLOG in 
attending meetings of OLOG's Board of Directors (it being understood and agreed 
by OLOG that first-class, round trip air fare and the cost of first-class hotel 
accommodations constitute reasonable out-of-pocket costs and expenses). Further
OLOG shall (i) at OLOG's sole cost and expenses, maintain directors liability
insurance coverage for the benefit of CIS's designees to the same extent, and on
terms no less favorable, than such insurance coverage is maintained for the
benefit of other OLOG directors and (ii) pay directors' fees to CIS's designees
on terms (including as to amount and the timing of payment) no less favorable
than those pursuant to which directors' fees are paid to other OLOG directors.

           F.   indemnify and hold harmless CIS and each other person, if any, 
who controls CIS within the meaning of the Securities Act, against any losses, 
claims, damages or liabilities, joint or several, to which CIS or such 
controlling person may become subject under the Securities Act or otherwise, 
insofar as such losses, claims, damages or liabilities (or actions in respect 
thereof) arise out of or are based upon any untrue statement or alleged untrue 
statement of any material fact contained in the Offering Circular, the 
Preliminary Offering Circular, any Additional Issuer Information or any Exchange
Act Reports (as each of such terms is defined in the Offering Circular), or any 
amendment or supplement thereof, or arise out of or are based upon the omission 
or alleged omission to state therein a material fact required to be stated 
therein or necessary to make the statements therein not misleading, and will 
reimburse CIS and each such controlling person for any legal or other expenses 
reasonably incurred by them in connection with investigating or defending any 
such loss, claim, damage, liability or action.  OLOG acknowledges and agrees (i)
that neither CIS nor any person who controls CIS has furnished any information 
in writing for use in the Offering Circular, the Preliminary Offering Circular, 
any Additional Issuer Information or any Exchange Act Reports and (ii) 
accordingly, that OLOG shall at all times refrain from alleging or stating 
otherwise for any reason whatsoever (including, without limitation, for the 
reason of exculpating OLOG from, or otherwise diminishing, OLOG's indemnity 
obligations hereunder and any contribution obligations OLOG may have under the 
third succeeding paragraph of this subsection 2(F)).

        Promptly after receipt by an indemnified party hereunder of notice of
the commencement of any action, such indem-

                                       6

<PAGE>
 
nified party shall, if a claim in respect thereof is to be made against OLOG 
hereunder, notify OLOG in writing thereof, but the omission so to notify OLOG 
shall not relieve it from any liability which it may have to any indemnified 
party other than under this subsection 2(F).  In case any such action shall be 
brought against any indemnified party and it shall notify OLOG of the 
commencement thereof, OLOG shall be entitled to participate in and, to the 
extent it shall wish, to assume and undertake the defense thereof with counsel 
satisfactory to such indemnified party, and, after notice from OLOG to such 
indemnified party of its election so to assume and undertake the defense 
thereof, OLOG shall not be liable to such indemnified party under this 
subsection 2(F) for any legal expenses subsequently incurred by such indemnified
party in connection with the defense thereof; provided, however, that, if the 
defendants in any such action include both the indemnified party and OLOG and 
the indemnified party shall have reasonably concluded that there may be 
reasonable defense available to it which are different from or additional to 
those available to OLOG, or if the interests of the indemnified party reasonably
may be deemed to conflict with the interests of OLOG, the indemnified party 
shall have the right to select a separate counsel and to assume such legal 
defenses and otherwise to participate in the defense of such action, with the 
expenses and fees of such separate counsel and other expenses related to such 
participation to be reimbursed by OLOG as incurred.

        Notwithstanding the foregoing, any indemnified party shall have the 
right to retain its own counsel in any such action, but the fees and 
disbursements of such counsel shall be at the expense of such indemnified party 
unless (i) OLOG shall have failed to retain counsel for the indemnified person 
as aforesaid or (ii) OLOG and such indemnified party shall have mutually agreed 
to the retention of such counsel.  It is understood that OLOG shall not, in 
connection with any action or related actions in the same jurisdiction, be 
liable for the fees and disbursements of more than one separate firm qualified 
in such jurisdiction to act as counsel for the indemnified party.  OLOG shall 
not be liable for any settlement of any proceeding effected without its written 
consent, but if settled with such consent or if there be a final judgment for 
the plaintiff, OLOG agrees to indemnify the indemnified party from and against 
any loss or liability by reason of such settlement or judgment.

        If the indemnification provided for in the first paragraph of this 
subsection 2(H) is unavailable or insufficient to hold harmless an indemnified 
party under such paragraph in respect of any losses, claims, damages or 
liabilities or actions in respect thereof referred to therein, then OLOG shall 
in lieu of indemnifying such indemnified party contribute to the amount paid or 
payable by such indemnified party as a result of such losses, claims, damages, 
liabilities or actions as appropriate to 

                                       7
<PAGE>
 
reflect the fault on the part of OLOG, on the one hand, and the absence of any 
fault on part of the indemnified party, on the other hand, in connection with 
the statements or omissions which resulted in such losses, claims, damages, 
liabilities or actions. The relative fault shall be determined by reference to, 
among other things, the fact that any such untrue or alleged untrue statement of
a material in no way relates to information supplied by the indemnified party. 
OLOG and CIS agree that it would not be just and equitable if contributions 
pursuant to this paragraph were determined by any method of allocation which did
not take account of the equitable considerations referred to above in this 
paragraph. The amount paid or payable by an indemnified party as a result of the
losses, claims, damages, liabilities or action in respect thereof, referred to 
above in this paragraph, shall be deemed to include any legal or other expenses 
reasonably incurred by such indemnified party in connection with investigating 
or defending any such action or claim. No person guilty of fraudulent 
misrepresentations (within the meaning of Section 11(f) of the Securities Act), 
shall be entitled to contribution from any person who is not guilty of such 
fraudulent misrepresentation.

        3. Representation and Warranty of CIS. CIS represents and warrants to 
OLOG that none of CIS, any affiliate of CIS or any person acting on behalf of 
CIS or any such affiliate has engaged, or will engage, in any Directed Selling 
Efforts with respect to the shares of OLOG Common Stock to be issued pursuant 
to the Master Agreement.

        4. Covenant of CIS. CIS covenants and agrees with OLOG to:

                A. ensure, to the extent such is within its control, that all 
Offering Restrictions applicable to the sale of shares of OLOG Common Stock to 
be issued pursuant to the Master Agreement are thoroughly complied with and 
satisfied; and

                B. refrain from engaging, and ensure, to the extent such is 
within its control, that none of its affiliates will engage, in any Directed 
Selling Efforts with respect to the shares of OLOG Common Stock to be issued 
pursuant to the Master Agreement.

        5. Governing Law, Etc. This letter agreement shall be governed by, and 
construed in accordance with, English law. Each party irrevocably agrees that 
the Courts of England shall have exclusive jurisdiction in relation to any 
claim, dispute  of difference concerning this letter agreement and any matter 
arising therefrom. Each party irrevocably waives any right to claim that the 
action has been brought in an inconvenient forum,or to claim that those Courts 
do not have jurisdiction. Each of the parties  agrees that any document in 
an action (including, but not limited to, any writ of summons or other 
originating process

                                       8
<PAGE>
 
or any third or other party notice) may be served on any party by being 
delivered to or left at its address for service of notices under Clause 12 of 
the Master Agreement.

        If the foregoing correctly sets forth our understanding of the subject 
matter hereof, kindly so indicate by signing this letter agreement and the 
accompanying duplicate copy hereof and returning such signed duplicate to the 
undersigned, whereupon this letter agreement will constitute our binding 
agreement concerning it subject matter.

                                        Very truly yours,

                                        OFFSHORE LOGISTICS, INC.


                                   By:  [Signature appears here]
                                        --------------------------------

AGREED AND ACCEPTED
as of the date first 
above written:

CALEDONIA INDUSTRIAL &
 SERVICES LIMITED



By: [Signature appears here]
    ------------------------------    
 


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