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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 SCHEDULE 14D-1


                                (Amendment No. 4)


                             Tender Offer Statement
     (Pursuant to Section 14(d)(1) of the Securities Exchange Act of 1934)


                                   ADT Limited
                               (Name of Subject Company)

                                Western Resources, Inc.
                                  Westar Capital, Inc.
                                       (Bidders)

                     Common Stock, Par Value $0.10 Per Share
                         (Title of Class of Securities)

                                     000915108
                      (CUSIP Number of Class of Securities)

                                   John K. Rosenberg
                     Executive Vice President and General Counsel
                                Western Resources, Inc.
                                818 Kansas Avenue
                              Topeka, Kansas 66612
                              Phone: (913) 575-6300

                     (Name, Address and Telephone Number of Person
                      Authorized to Receive Notices and Communications
                                  on Behalf of Bidders)




                                        Copy to:

                                    Neil T. Anderson
                                   Sullivan & Cromwell
                                    125 Broad Street
                                 New York, New York 10004
                                     (212) 558-4000










This  Amendment  No.4  amends and  supplements  the Tender  Offer  Statement  on
Schedule 14D-1 (the "Schedule  14D-1"),  originally filed by Western  Resources,
Inc., a Kansas corporation ("Western Resources"),  on March 17, 1997 relating to
the exchange offer disclosed  therein to exchange all of the outstanding  Shares
for shares of Western  Resources  Common Stock upon the terms and subject to the
conditions  set forth in the  Prospectus,  dated March 14, 1997, and the related
Letter of Transmittal.  Capitalized terms used and not defined herein shall have
the meanings set forth in the Schedule 14D-1.


Item 11.          Material to be Filed as Exhibits.

         Item 11 is  hereby  amended  and  supplemented  by adding  thereto  the
following:

(a)(4)   Press release/employee update issued on April 4, 1997






                                    SIGNATURE

         After due 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.


                                                WESTERN RESOURCES, INC.

Date       April 7, 1997                       By   /s/ JERRY D. COURINGTON
     -----------------------                      -------------------------
                                                    Jerry D. Courington,
                                                         Controller







                                INDEX TO EXHIBITS


                                                                    Sequentially
                                                                     Numbered
Exhibit No.                     Description                           Pages

(a)(4)                     Press release/employee update                1
                             issued on April 4, 1997







                                                            Exhibit No. (a)(4)

The following press release/employee update was issued on April 4, 1997:

                           WESTERN RESOURCES ANNOUNCES
                          NEW SHAREOWNER MEETING DATES

         TOPEKA, Kansas, April 4, 1997 -- Western Resources today announced that
     its Annual  Meeting of  Shareowners  has been  scheduled  for May 29, 1997,
     Topeka.  Shareowners  of record on April 18 will be  entitled to attend and
     vote at the annual meeting.
        Western Resources also announced a special meeting of its shareowners on
     June 17, 1997, to consider its proposal to issue Western  Resources  common
     shares in  connection  with its offer to acquire ADT Limited,  the nation's
     largest monitored security company.



        Western  Resources  (NYSE:WR)  is  a  full-service,  diversified  energy
     company with total assets of more than $6 billion.  Its utilities,  KPL and
     KGE,  operating  in Kansas and  Oklahoma,  provide  natural  gas service to
     approximately  650,000  customers  and  electric  service to  approximately
     600,000  customers.  Western  Resources,  through  its  subsidiary,  Westar
     Security,  also is the nation's third-largest  monitored security provider,
     operating  in  46  states  in  the  U.S.  Through  its  other   unregulated
     subsidiaries,  Westar Energy,  Westar  Capital,  and The Wing Group, a full
     range of energy and energy-related  products and services are developed and
     marketed in the continental U.S. and offshore.

        For  more  information   about  Western   Resources  and  its  operating
     companies, visit us on the Internet at http://www.wstnres.com.


This press  release/employee  update is neither an offer nor an  exchange  nor a
solicitation of an offer to exchange shares of common stock of ADT Limited. Such
offer is made solely by the  Prospectus  dated March 14,  1997,  and the related
Letter of  Transmittal,  and is not being made to, nor will  tenders be accepted
from or on behalf of,  holders of shares of common  stock of ADT  Limited in any
jurisdiction  in which the making of such offer or the acceptance  thereof would
not be in compliance with the laws of such  jurisdiction.  In any  jurisdictions
where  securities,  blue sky or other  laws  require  such offer to be made by a
licensed  broker or dealer,  such offer  shall be deemed to be made on behalf of
Western  Resources,  Inc. by Salomon Brothers Inc; Bear,  Stearns & Co. Inc; and
Chase  Securities  Inc, or one or more  registered  brokers or dealers  licensed
under the laws of such jurisdiction.