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 September 5, 2005 BRITISH ENERGY GROUP PLC (Registrant's name) Systems House Alba Campus Livingston EH54 7EG (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: Section 198 Notice dated 5 September, 2005 5 September 2005 British Energy Group plc NOTIFICATIONS UNDER SECTIONS 198 TO 202 - UK COMPANIES ACT British Energy Group plc has received notification from Fidelity Investments of the following: 1. Company in which shares are held: British Energy Group plc 2. Notifiable interest: Ordinary Shares (A) FMR Corp. 82 Devonshire Street Boston, MA 02109 Parent holding company of Fidelity Management & Research Company (FMRCO), investment manager for US mutual funds, and Fidelity Management Trust Company (FMTC), a US state chartered bank which acts as a trustee or investment manager of various pension and trust accounts. (See Schedule A for listing of Registered Shareholders and their holdings). (B) Fidelity International Limited (FIL) P.O. Box HM 670 Hamilton HMCX, Bermuda Parent holding company for various direct and indirect subsidiaries, including Fidelity Investment Services Ltd. (FISL) and Fidelity Gestion (FIGEST), Fidelity Investments Advisory (Korea) Limited (FIA(K) L), Fidelity Investments Management (Hong Kong) Limited (FIMHK), Fidelity Pension Management (FPM), Fidelity Investments Japan (FIJ) and Fidelity Investments International (FII), investment managers for various non-US investment companies and institutional clients. 3. The notifiable interests also comprise the notifiable interest of: Mr. Edward C. Johnson 3d 82 Devonshire Street Boston, MA 02109 A principal shareholder of Fidelity International Limited. 4. The notifiable interests include interest held on behalf of authorised unit trust schemes in the UK, notwithstanding the exemption from reporting pursuant to Section 209 (1)(h) of the Companies Act 1985. 5. These notifications of disclosable interests constitute separate notifications of interest in the shares and are combined solely for the purposes of clarity and efficiency. Nothing herein should be taken to indicate that Fidelity International Limited and its direct and indirect subsidiaries or Mr Edward C Johnson 3d act as a group or in concert in respect of the disclosed interests, or that they are required to submit these notifications on a joint basis. 6. The disclosable interests arise under section 208 (4) (b) of the Act, namely where a person, not being the registered holder, is entitled to exercise a right conferred by the holding of the shares or to control the exercise of such rights, or under section 203 of the Act respectively. Schedule A Security: British Energy Group plc SHARES MANAGEMENT NOMINEE/REGISTERED NAME HELD COMPANY 2,095,900 FPM Northern Trust London 1,546,700 FPM Bank of New York Brussels 827,100 FPM Mellon Bank 573,000 FPM State Str Bk and Tr Co Lndn (S Total) 403,100 FPM JP Morgan, Bournemouth 273,900 FPM HSBC Bank Plc 169,000 FPM Bankers Trust London 83,000 FPM Midland Securities Services 67,000 FPM Clydesdale Bank Plc 2,159,880 FMRCO JP Morgan Chase Bank 274,800 FMRCO Mellon Bank N.A 9,963,084 FISL JP Morgan, Bournemouth 667,540 FIL Brown Bros Harrimn Ltd Lux 375,600 FIL HSBC Bank Plc 353,700 FIL JP Morgan, Bournemouth 210,600 FIL Bank of New York Brussels 178,050 FIL BNP Paribas, Paris (C) 130,800 FIL Northern Trust London 64,300 FIJ Brown Brothers Harriman and Co 1,602,500 FII Bank of New York Europe Ldn 374,959 FII JP Morgan, Bournemouth 187,600 FIGEST CDC Finance 22,582,093 Grand Total Ordinary Shares Current ownership percentage 4.03% Shares in issue: 561,016,515 On 13 July 2005, the Company disclosed that Fidelity had a notifiable interest in 17,306,373 shares (3.08%). 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: September 5, 2005 BRITISH ENERGY GROUP PLC By:____John Searles____ Name: John Searles Title: Director - Investor Relations