Great Portland Estates PLC 28 June 2007 The following amendment has been made to the 'Holding in Company' announcement released on 27/6/07 at 17:08 under RNS No 1556Z. The total percentage of voting rights should read 4.097% and not 6.097% as previously stated. All other details remain unchanged. The full amended text is shown below. TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES (1). Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: GREAT PORTLAND ESTATES plc 2. Reason for the notification (yes/no) An acquisition or disposal of voting rights: (Yes) 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 the notification obligation: GOVERNMENT OF SINGAPORE INVESTMENT CORPORATION PRIVATE LIMITED 4. Full name of shareholder(s) (if different from 3.): SECURITIES MANAGEMENT TRUST LIMITED AND NORTRUST NOMINEES LTD (as registered holders and nominees) 5. Date of the transaction and date on which the threshold is crossed or reached if different): 26 June 2007 6. Date on which issuer notified: 27 June 2007 7. Threshold(s) that is/are crossed or reached: ABOVE 4% 8. Notified details: A: Voting rights attached to shares Class/type of shares Situation previous to if possible using the the Triggering ISIN CODE transaction Number of shares Number of voting Rights Ordinary shares 5,868,011 3.556% 12.5p each ISIN GB00B01FLL16 Resulting situation after the triggering transaction Class/type of shares Number of shares Number of voting rights % of voting rights if possible using the ISIN CODE Direct Direct Indirect Direct Indirect Ordinary shares 7,415,902 7,360,132 55,770 4.066% 0.031% 12.5p each ISIN GB00B01FLL16 B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Date Exercise/Conversion Number of voting % of voting financial Period/ Date rights that may be rights instrument acquired if the instrument is exercised/ converted. N/A N/A N/A N/A N/A Total (A+B) Number of voting rights % of voting rights 7,415,902 *4.097% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: N/A Proxy Voting: 10. Name of the proxy holder: N/A 11. Number of voting rights proxy holder will cease to hold: N/A 12. Date on which proxy holder will cease to hold voting rights: N/A 13. Additional information: Contact address of person subject to notification obligation: 168 Robinson Road Capital Tower #37-01 Singapore 068912 14. Contact name: Ms. Celina Chua 15. Contact telephone number: (65) 6889 8503 This information is provided by RNS The company news service from the London Stock Exchange