Holding(s) in Company

Diploma PLC 30 July 2007 Letter to: Diploma PLC Dated: 26 July 2007 Major Shareholding Notification I hereby inform you that as at 25-July-07 Barclays PLC, through the legal entities listed in the enclosed notification, held 6.88% of the total voting rights attaching to shares in your Company. Full details of our interest are set out in the attached notification. As you will be aware, following the implementation of the Transparency Directive in the UK, the requirements for the notification of major shareholdings have changed. The obligation to notify is now based upon control over the exercise of voting rights attached to shares and financial instruments rather than 'interests in shares'. Additionally we now have the opportunity to disaggregate certain holdings held for the benefit of clients from our notification. The result of these changes is that the interest set out in this notification may be inconsistent with previous disclosures made to you but will be the basis of notifications going forward. From: Geoff Smith 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: Diploma Plc 2. Reason for the notification (please tick the appropriate box or boxes): 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 the notification obligation: Barclays PLC 4. Full name of shareholder(s) (if different from 3.): 5. Date of the transaction and date on which the threshold is crossed or reached if different): 25-Jul-07 6. Date on which issuer notified: 26-Jul-07 7. Threshold(s) that is/are crossed or reached: 7% to 6% 8. Notified details: A: Voting rights attached to shares Class/type of shares Situation previous to the Triggering if possible using the transaction ISIN CODE Number of shares Number of voting Rights GB0001826634 1,593,407 1,593,407 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 Indirect Direct Indirect GB0001826634 1,558,562 0 1,558,562 0.00 6.88 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. Total (A+B) Number of voting rights % of voting rights 1,558,562 6.88 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: Barclays Capital Securities Ltd Barclays Global Investors Ltd Barclays Life Assurance Co Ltd Barclays Stockbrokers 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: Geoff Smith 15. Contact telephone number: 020 7116 2913 This information is provided by RNS The company news service from the London Stock Exchange

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Diploma (DPLM)
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