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