Arrowstreet Capital - Rule 8.3- (British Energy)

RNS Number:5954S
Arrowstreet Capital
17 April 2008

FORM 8.3

DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE
(Rule 8.3 of the Takeover Code)

1. KEY INFORMATION

Name of person dealing (Note 1) Arrowstreet Capital,
Limited Partnership

Company dealt in British Energy Group PLC

Class of relevant security to which the dealings
being disclosed relate (Note 2)

Date of dealing April 16, 2008

2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

Long Short
Number (%) Number (%)
(1) Relevant securities 11,874,319 1.15%
(2) Derivatives (other than options)
(3) Options and agreements to purchase/sell
Total 11,874,319 1.15%

(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)

Class of relevant security: Long Short
Number (%) Number (%)
(1) Relevant securities
(2) Derivatives (other than options)
(3) Options and agreements to purchase/sell
Total

(c) Rights to subscribe (Note 3)

Class of relevant security: Details

3. DEALINGS (Note 4)

(a) Purchases and sales

Date of Dealing Purchase/sale Number of Price per unit (Note 5)
securities

4/16/2008 Sale 445,257 7.24 GBP

(b) Derivatives transactions (other than options)

Product Long/short Number of securities Price per unit
name, (Note 6) (Note 7) (Note 5)
e.g. CFD

(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

Product Writing, Number of Exercise Type, e.g. Expiry Option
name, selling, securities to price American, date money
purchasing, which the option European paid/
varying relates (Note 7) etc. received
etc. per unit
e.g. (Note 5)
call
option

(ii) Exercising

Product name, e.g. call Number of Exercise price per unit
option securities (Note 5)

(d) Other dealings (including new securities) (Note 4)

Nature of transaction (Note 8) Details Price per unit (if applicable) (Note 5)

4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person
disclosing and any other person relating to the voting rights of any relevant
securities under any option referred to on this form or relating to the voting
rights or future acquisition or disposal of any relevant securities to which any
derivative referred to on this form is referenced. If none, this should be
stated.

Is a Supplemental Form 8 attached? (Note 9) YES/NO

Date of disclosure April 17, 2008

Contact name Vaithehi Muttulingam,
CPA, CFA

Telephone number 617-919-0000

If a connected EFM, name of offeree/offeror with
which connected

If a connected EFM, state nature of connection
(Note 10)

Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at
www.thetakeoverpanel.org.uk

This information is provided by RNS
The company news service from the London Stock Exchange

END
RETEDLFFVZBZBBE