FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                            Report of Foreign Issuer


                      Pursuant to Rule 13a-16 or 15d-16 of
                       the Securities Exchange Act of 1934


                                 June 29, 2004


                               BRITISH ENERGY PLC
                               (Registrant's name)


                               3 Redwood Crescent
                                    Peel Park
                              East Kilbride G74 5PR
                                    Scotland
                    (Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

                          Form 20-F..X.. Form 40-F.....

Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                               Yes ..... No ..X..

If "Yes" is marked, indicate below the file number assigned to the registrant
in connection with Rule 12g3-2(b):



                                 Exhibit Index

The following document (bearing the exhibit number listed below) is furnished
herewith and is made a part of this Report pursuant to the General Instructions
for Form 6-K:

Exhibit       Description

No. 1         RNS Announcement, re: Notice of Interest in Shares
              dated 29 June, 2004


29 June 2004



British Energy plc

Notification of Interest in Shares pursuant to Part VI of the Companies Act 1985
(as amended)

In accordance with Part VI of the Companies Act 1985 (as amended), please note
that the interests of Cater Allen International Limited (CAIL) in the ordinary
shares of British Energy plc has increased to 18,749,022 ordinary shares or
3.02% of the issued share capital.

This holding has arisen from stock loan transactions done under the relevant
approved documentation as a principal trading member of the London Stock
Exchange.

END
                               SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


Date:  June 29, 2004                       BRITISH ENERGY PLC

                                           By:____Paul Heward____

                                           Name:  Paul Heward
                                           Title: Director - Investor Relations