Holding(s) in Company

Diploma PLC
13 February 2004


LETTER TO RNS

We enclose a copy of a letter received today from Aviva PLC and its subsidiary
company, Morley Fund Management Limited notifying their interest in 4.91% of our
issued share capital.

LETTER FROM DIPLOMA PLC



LETTER TO DIPLOMA PLC 

LETTER DATED 23 January 2004

DIPLOMA PLC (THE 'COMPANY') - SEDOL 0182663

This notification supersedes our previous notification to you dated 23 January 
2004 and is prompted by sales totalling 149,460 on 12 February 2004.

This notification relates to issued ordinary shares of GBP0.05 each in the
capital of the Company (the 'shares') and is given in fulfilment of the
obligations imposed by sections 198 to 202 of the Companies Act 1985 (the
'Act').

1.    Notification on behalf of Morley Fund Management Limited (a subsidiary of
      Aviva plc).

1.1   We hereby notify you on behalf of Morley Fund Management Limited that
      immediately after the time when the obligation to make this notification 
      arose Morley Fund Management Limited were interested in 1,111,653 shares.

1.2   The identity of the registered holders of the shares to which this
      notification relates and the number of shares held by each of them are set 
      out in the attached Appendix: Money Fund Management Limited.

2.    Notification on behalf of Aviva plc.

2.1   We hereby notify you on behalf of Aviva plc that immediately after the
      time when the obligation to make this notification arose Aviva plc were
      interested in 1,111,653 shares giving the Aviva group a total percentage
      interest in the shares of 4.91%.

2.2   The identity of the registered holders of the shares to which this
      notification relates and the number of shares held by each of them are set 
      out in the attached Appendix: Aviva plc.

If you require further information as to which companies in the Aviva group hold
interests in the shares (by virtue of s.203 of the Act) please submit a written
request and we will be happy to supply this information.

We are only required to notify interests which are defined as material interests
when the holding is equal to 3% or more of the Company's relevant share capital.
The term material interests exclude certain categories where we do not hold a
beneficial interest, for example where the shares are held in an Authorised Unit
Trust Scheme or Open Ended Investment Company. Holdings in those categories are
therefore not included in the holding notified under this letter, if you wish us
to confirm the level of holdings in these categories, please let us know.

LETTER FROM AVIVA PLC




To: Company Secretary                                          13 February 2004 
    Diploma plc


APPENDIX: MORLEY FUND MANAGEMENT LIMITED

REGISTERED HOLDERS                     NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd             75,065 (Material)
Chase GA Group Nominees Ltd               915,263 (Material)
CUIM Nominee Ltd                          121,263 (Material)

TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED: 4.91% 
ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911




To: Company Secretary                                          13 February 2004 
    Diploma plc
 

APPENDIX: AVIVA PLC 

REGISTERED HOLDERS                     NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd             75,065 (Material)
Chase GA Group Nominees Ltd               915,263 (Material)
CUIM Nominee Ltd                          121,325 (Material)

TOTAL PERCENTAGE INTEREST OF AVIVA PLC: 4.91% 
ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911



                      This information is provided by RNS
            The company news service from the London Stock Exchange