Holding(s) in Company

Diploma PLC
26 January 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 5.96% 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 12 December
2003 and is prompted by sales totalling 9,159 on 22 January 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 1,350,249 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 1,350,249 shares giving the Aviva group a total percentage
interest in the shares of 5.96%.

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




                                                                23 January 2004 
APPENDIX: MORLEY FUND MANAGEMENT LIMITED


REGISTERED HOLDERS                     NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd            103,920 (Material)
Chase GA Group Nominees Ltd               936,415 (Material)
Chase Nominees Ltd                         26,076 (Material)
CUIM Nominee Ltd                          206,809 (Material)
RBSTB Nominees Ltd                         77,029 (Material)

TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED: 5.96% 
ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911


                                                                23 January 2004 
 
APPENDIX: AVIVA PLC 

REGISTERED HOLDERS                     NUMBER OF SHARES HELD

BNY Norwich Union Nominees Ltd            103,920 (Material)
Chase GA Group Nominees Ltd               936,415 (Material)
Chase Nominees Ltd                         26,076 (Material)
CUIM Nominee Ltd                          206,809 (Material)
RBSTB Nominees Ltd                         77,029 (Material)

TOTAL PERCENTAGE INTEREST OF AVIVA PLC: 5.96% 
ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911



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