Holding(s) in Company

Diploma PLC
22 May 2007


For filings with the FSA include the annex
For filings with issuer exclude the annex


TR-1: Notifications 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  - (ISIN GB0001826634)

2. Reason for notification 
(please place an X inside the appropriate bracket/s):

An acquisition or disposal of voting rights:                               (YES)

An acquisition or disposal of financial instruments which may result in the 
acquisition of shares already issued to which voting rights are attached:  (NO)

An event changing the breakdown of voting rights:                          (NO)

Other (please specify) :                                                   (NO)


3. Full name of person(s) subject to notification obligation:

UBS GLOBAL ASSET MANAGEMENT - TRADITIONAL ENTITIES

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

UBS GLOBAL ASSET MANAGEMENT LIFE LIMITED

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

18TH MAY 2007

6. Date on which issuer notified:

21ST MAY 2007

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

3.75%

8. Notified Details:

A: Voting rights attached to shares
 
Class/type of shares              Situation previous to  
if possible use                 the Triggering transaction                
ISIN CODE                       
                       Number of shares       Number of voting Rights 


GB0001826634               927,467                927,467
 

                            Resulting situation after the triggering transaction 
 
Class/type of shares   Number of shares  Number of voting rights    % of voting rights  
if possible use                                                                 
ISIN CODE                                Direct     Indirect        Direct    Indirect  

                          849,867        849,867      -             3.75%      -

 

B: Financial Instruments

Resulting situation after the triggering transaction 

Type of     Expiration date  Exercise/conversion  No. of voting     % of voting     
financial                    period/date          rights that may   rights          
instrument                                        be acquired (if                       
                                                  the instrument                         
                                                  exercised/
                                                  converted)                           

 -              -                    -               -                 -

Total (A+B)
Number of voting rights       % of voting rights 

849,867                           3.75%
 

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

UBS GLOBAL ASSET MANAGEMENT LIFE LIMITED - 849,867  -  3.75%
 


Proxy Voting:

 
10. Name of proxy holder:

UBS GLOBAL ASSET MANAGEMENT ON BEHALF OF A NUMBER OF ASSET MANAGEMENT CLIENTS.
 

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:

ANGELA HUFF
ASSOCIATE DIRECTOR
UBS AG
 

15. Contact telephone number:

0207 568 4981


For notes on how to complete form TR-1 please see the FSA website.

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