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Informa PLC 28 April 2008 TR-1: Notifications of Major Interests in Shares 1. Identity of the issuer or the underlying issuer of INFORMA PLC existing shares to which voting rights are attached: 2. Reason for notification (yes/no) An acquisition or disposal of voting rights YES An acquisition or disposal of financial instruments which may result in the acquisition NO 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 notification STANDARD LIFE INVESTMENTS LTD obligation: 4. Full name of shareholder(s) (if different from VIDACOS NOMINEES 3): 5. Date of transaction (and date on which the 24 APRIL 2008 threshold is crossed or reached if different): 6. Date on which issuer notified: 25 APRIL 2008 7. Threshold(s) that is/are crossed or reached: 6% 8: Notified Details A: Voting rights attached to shares Class/type of Situation previous to the Resulting situation after the triggering transaction shares triggering transaction Number of Number of Number of Number of voting Percentage of voting If possible use shares voting rights shares rights rights ISIN code Direct Indirect Direct Indirect GB0002625654 21,753,437 21,753,437 25,775,503 17,205,996 8,569,507 4.049% 2.017% B: Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration date Exercise/ conversion No. of voting rights Percentage of voting instrument period/date that may be acquired rights (if the instrument exercised/converted) Total (A+B) Number of voting rights Percentage of voting rights 25,775,503 6.066% 9. Chain of controlled undertakings through which the voting rights and /or the financial instruments are effectively held, if applicable: STANDARD LIFE INVESTMENTS LTD Proxy Voting: 10. Name of proxy holder: N/A 11. Number of voting rights proxy holder will cease N/A to hold: 12. Date on which proxy holder will cease to hold N/A voting rights: 13. Additional information: N/A 14 Contact name: ALISON KENNEDY CORPORATE GOVERNANCE MANAGER - ENGAGEMENT STANDARD LIFE INVESTMENTS LTD 15. Contact telephone name: 0131 245 2289 Annex: Notification of major interests in shares A: Identity of the persons or legal entity subject to the notification obligation Full name INFORMA PLC (including legal form of legal entities) Contact address 37-41 MORTIMER STREET (registered office for legal entities) LONDON, W1T 3JH Phone number & email 020 7017 4314 julie.wilson@informa.com Other useful information JULIE WILSON (at least legal representative for legal persons) DEPUTY COMPANY SECRETARY B: Identity of the notifier, if applicable Full name Contact address Phone number & email Other useful information (e.g. functional relationship with the person or legal entity subject to the notification obligation) C: Additional information This information is provided by RNS The company news service from the London Stock Exchange

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