Holding(s) in Company

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



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