Holding(s) in Company

Diploma PLC
14 April 2008


                                                                    

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:

FMR LLC
 

4. Full name of shareholder(s) (if different from 3.):

SEE ATTACHED SCHEDULE
 

5. Date of the transaction and date on which the threshold is crossed or reached
if different):

10 APRIL 2008
 

6. Date on which issuer notified:

14 APRIL 2008
 

7. Threshold(s) that is/are crossed or reached:

5%
 

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 


ISIN -
GB0001826634               5,607,220              5,607,220
 

                     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            Direct     Indirect        Direct    Indirect  

ISIN -
GB0001826634                                      5,670,920                  5.00%

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 

5,670,920                          5.00%
 

9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:


SEE ATTACHED SCHEDULE


Proxy Voting:

 
10. Name of the proxy holder:

FMR LLC
 

11. Number of voting rights proxy holder will cease to hold:

63,700 SHARES
 

12. Date on which proxy holder will cease to hold voting rights:

10 APRIL 2008
 

13. Additional information:


 

14. Contact name:

DAVID MERRYWEATHER
 

15. Contact telephone number:

[e-mail]




FMR

Issuer name:                    DIPLOMA PLC

Current ownership percentage:                                     5.00%

Total shares held:                                            5,670,920

Issued share capital:                                       113,239,555

                                                                                                         MANAGEMENT
                                                   SHARES HELD        NOMINEE                            COMPANY

FMR LLC is the parent holding                          307,900        BROWN BROTHERS HARRIMAN AND CO     FMRCO
company of Fidelity Management                         200,000        CITIBANK NA                        FMRCO
& Research Company (FMRCO),                            141,100        MELLON BANK N.A.                   FMRCO
investment manager for US                            5,021,920        STATE STREET BANK AND TR CO.       FMRCO
mutual funds, and Fidelity
Management Trust Company (FMTC)
and Pyramis Global Advisors Trust 
Company (PGATC), a US state chartered 
bank which acts as a trustee or investment
manager of various pension and
trust accounts and Pyramis Global Advisors LLC
(PGALLC)




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