Holding(s) in Company

Diploma PLC 03 January 2008 LETTER TO: DIPLOMA PLC 24 December 2007 Major Shareholding Notification I hereby inform you that as at 20-December-07 Barclays PLC no longer held reportable 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 (Barclays Compliance) 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 state 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 the notification obligation: BARCLAYS PLC 4. Full name of shareholder(s) (if different from 3.): BARCLAYS CAPITAL SECURITIES LTD BARCLAYS GLOBAL INVESTORS LTD BARCLAYS LIFE ASSURANCE CO LTD BARCLAYS STOCKBROKERS LTD 5. Date of the transaction and date on which the threshold is crossed or reached if different): 20 DECEMBER 2007 6. Date on which issuer notified: 24 DECEMBER 2007 7. Threshold(s) that is/are crossed or reached: 4% TO 1% 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 GB0001826634 986,704 986,704 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 NOT REPORTABLE NOT REPORTABLE NOT REPORTABLE NOT REPORTABLE NOT REPORTABLE 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 NOT REPORTABLE NOT REPORTABLE 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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