Holding(s) in Company

Diploma PLC
30 July 2007




Letter to:  Diploma PLC
Dated:      26 July 2007


Major Shareholding Notification

I hereby inform you that as at 25-July-07 Barclays PLC, through the legal
entities listed in the enclosed notification, held 6.88% of the total 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 




               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 tick the appropriate box or boxes):

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.):




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

25-Jul-07

 

6. Date on which issuer notified:

26-Jul-07


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

7% to 6%

 

8. Notified details:
 


A: Voting rights attached to shares

 
Class/type of shares            Situation previous to  
                                the Triggering  
if possible using the           transaction        
ISIN CODE                              

                       Number of shares       Number of voting Rights 

GB0001826634           1,593,407              1,593,407



 

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           1,558,562          0          1,558,562       0.00      6.88

 



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 

1,558,562                     6.88


 

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





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