TR-1: Notifications of Major Interests in Shares 1. Identity of the issuer or the underlying Serco Group plc issuer of existing shares to which voting

rights are attached:

2. Reason for notification (yes/no) An acquisition or disposal of voting rights x An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting

rights are attached

An event changing the breakdown of voting rights Other (please specify):______________ 3. Full name of person(s) subject to Resolution Investment Services Limited notification obligation:

4. Full name of shareholder(s) (if

different from 3):

5. Date of transaction (and date on 27/8/2008 which the threshold is crossed or

reached if different):

6. Date on which issuer notified: 29/8/2008 7. Threshold(s) that is/are crossed or 3%

reached:

8: Notified Details Nominee Holdings A: Voting rights attached to shares

Class/ Situation Resulting situation after the triggering type of previous to the transaction shares triggering transaction If possible use ISIN code Number Number of Number Number of voting Percentage of of voting of rights voting rights shares rights shares Direct Indirect Direct Indirect GB0007973794 13,968,116 2.87% B: Financial Instruments Resulting situation after the triggering transaction

Type of Expiration Exercise/ No. of voting Percentage of financial date conversion rights that may be voting rights instrument period/date acquired (if the instrument exercised/ converted) Total (A+B) Number of voting rights Percentage of voting rights 13,968,116 2.87%

9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable:

Pearl Group Limited Impala Holdings Limited Resolution PLC

Resolution Asset Management Limited Resolution Investment Services Limited (indirect) Bank of New York Nominees Ltd (1,371,856 0.28%) Vidacos Nominees Ltd (10,635,813 2.19%) Mellon Bank NA (1,106,781 0.23%) Nortrust Nominees Ltd (418,808 0.09%) State Street Nominees (434, 858 0.09%)

Proxy Voting: 10. Name of proxy holder:

11. Number of voting rights proxy

holder will cease to hold:

12. Date on which proxy holder will

cease to hold voting rights: 13. Additional information: Percentage calculation based on Issued Share Capital of 485,931,000 14 Contact name: Deborah A Wagner 15. Contact telephone name: 0141 222 8000