Great Portland Estates PLC 19 March 2008 TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES (1). Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii): 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 no in the acquisition of shares already issued to which voting rights are attached: An event changing the breakdown of voting rights: no Other (please specify) : no 3. Full name of person(s) subject to the notification obligation (iii): Standard Life Investments Ltd 4. Full name of shareholder(s) (if different from 3.) (iv): Vidacos Nominees 5. Date of the transaction and date on which the threshold is crossed or reached if different) (v): 18 March 2008 6. Date on which issuer notified: 19 March 2008 7. Threshold(s) that is/are crossed or reached: 5% 8. Notified details: A: Voting rights attached to shares Class/type of shares If possible using ISIN code: GB00B01FLL16 Situation previous to the triggering transaction: Number of shares: Number of voting rights: 9,270,303 9,270,303 Resulting situation after the triggering transaction Number of shares Number of voting rights % of voting rights Direct Indirect Direct Indirect 8,761,764 2,402,618 6,359,146 1.327% 3.513% B: Financial Instruments Resulting situation after the triggering transaction (xii) Type of Expiration Date Exercise/Conversion Number of voting % of voting financial (xiii) Period/ Date (xiv) rights that may be rights instrument acquired if the instrument is exercised/ converted. Total (A+B) Number of voting rights % of voting rights 8,761,764 4.840% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable (xv): Standard Life Investments Ltd Proxy Voting: 10. Name of the 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: 14. Contact name: Alison Kennedy Corporate Governance Manager - Engagement Standard Life Investments Ltd 15. Contact telephone number: (0131) 245 2289 This information is provided by RNS The company news service from the London Stock Exchange