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Diploma PLC 11 December 2006 Letter to Diploma Plc dated 7 December 2006 Enclosed are amended notifications of disclosable interests under the U.K. Companies Act 1985. Please note that while this information details the disclosable interests of more than one entity, the enclosed disclosure constitutes separate notifications of interest which have been combined solely for purposes of clarity and efficiency. It is not intended to indicate that any of these entities act as a group or in concert with respect to these interests. These disclosures are made in the interest of conformity with the Companies Act. The interest detailed herein were acquired solely for investment purposes. For disclosure purposes, holdings should be represented as FMR Corp. and its direct and indirect subsidiaries, and Fidelity International Limited (FIL) and its direct and indirect subsidiaries, both being non-beneficial holders. From Fidelity International Amendment 23 NOTIFICATIONS UNDER SECTIONS 198 TO 202 - - U.K. COMPANIES ACT 1. Company in which shares are held: Diploma Plc 2. Notifiable Interest: Ordinary Shares (A) FMR Corp. 82 Devonshire Street Boston, MA 02109 Parent holding company of Fidelity Management & Research Company (FMRCO), investment manager for US mutual funds, and Fidelity Management Trust Company (FMTC), a US state chartered bank which acts as a trustee or investment manager of various pension and trust accounts. (See Schedule A for listing of Registered Shareholders and their holdings). (B) Fidelity International Limited (FIL) P.O. Box HM 670 Hamilton HMCX, Bermuda Parent holding company for various direct and indirect subsidiaries, including Fidelity Investment Services Ltd. (FISL), Fidelity Gestion (FIGEST), Fidelity Investments Advisory (Korea) Limited (FIA(K)L), Fidelity Investments Management (Hong Kong) Limited (FIMHK), Fidelity Pension Management (FPM), Fidelity Investments Japan (FIJ) and Fidelity Investments International (Fll), investment managers for various non-US investment companies and institutional clients. 3. The notifiable interests also comprise the notifiable interest of: Mr. Edward C. Johnson 3d 82 Devonshire Street Boston, MA 02109 A principal shareholder of FMR Corp. and Fidelity International Limited. 4. The notifiable interests include interest held on behalf of authorized unit trust schemes in the U.K., notwithstanding the exemption from reporting pursuant to Section 209 (1) (h) of the Companies Act 1985. 5. These notifications of disclosable interests constitute separate notifications of interest in the shares and are combined solely for the purposes of clarity and efficiency. Nothing herein should be taken to indicate that FMR Corp. and its direct and indirect subsidiaries, Fidelity International Limited and its direct and indirect subsidiaries or Mr. Edward C. Johnson 3d act as a group or in concert in respect of the disclosed interests, or that they are required to submit these notifications on a joint basis. 6. The disclosable interests arise under section 208 (4) (b) of the Act, namely where a person, not being the registered holder, is entitled to exercise a right conferred by the holding of the shares or to control the exercise of such rights, or under section 203 of the Act respectively. Rani Jandu Regulatory Reporting Manager, FIL - Investment Compliance Duly authorized under Powers of Attorney dated August 25, 2004 by Eric D. Roiter by and on behalf of FMR Corp. and its direct and indirect subsidiaries, and Fidelity International Limited and its direct and indirect subsidiaries. Schedule A Amendment 23 Security: DIPLOMA PLC Current ownership percentage: 4.49% Total Shares Held 1,017,578 Shares in Issue: 22,647,911 Change in holdings since last filing: (330,723) ordinary shares MANAGEMENT SHARES HELD COMPANY NOMINEE/REGISTERED NAME 53,200 FPM JP MORGAN, BOURNEMOUTH 234,400 FPM NORTHERN TRUST LONDON 53,833 FPM JP MORGAN, BOURNEMOUTH 40,700 FPM MELLON BANK 35,000 FPM BANK OF NEW YORK BRUSSELS 145,400 FMRCO STATE STREET BANK AND TR CO 193,345 FISL JP MORGAN, BOURNEMOUTH 73,900 FIL JP MORGAN, BOURNEMOUTH 11,300 FIL BROWN BROS HARRIMN LTD LUX 176,500 FII BANK OF NEW YORK EUROPE LDN This information is provided by RNS The company news service from the London Stock Exchange

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