Holding(s) in Company

Diploma PLC
13 December 2006


Letter to Diploma Plc dated 12 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 Sophie Hughes
     Regulatory Reporting Analyst
     Fidelity International


Amendment 24

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 24 

Security: DIPLOMA PLC

Current ownership percentage:     3.91%

Total Shares Held                 884,578

Shares in Issue:                  22,647,911

Change in holdings since 
last filing:                     (133,000) ordinary shares


                                      MANAGEMENT 
                   SHARES HELD        COMPANY       NOMINEE/REGISTERED NAME
                       203,900         FPM          NORTHERN TRUST LONDON
                        53,833         FPM          JP MORGAN, BOURNEMOUTH
                        35,000         FPM          BANK OF NEW YORK BRUSSELS
                        33,200         FPM          MELLON BANK
                        11,900         FMTC         STATE STREET BANK AND TR CO
                       145,400         FMRCO        STATE STREET BANK AND TR CO
                       188,545         FISL         JP MORGAN, BOURNEMOUTH
                        59,500         FIL          JP MORGAN, BOURNEMOUTH
                        11,300         FIL          BROWN BROS HARRIMN LTD LUX
                       142,000         FII          BANK OF NEW YORK EUROPE LDN




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