Holding(s) in Company

Diploma PLC
13 May 2002


LETTER TO: RNS

Below is a copy of a letter received today from CGNU and its subsidiary
company, Morley Fund Management Limited notifying their interest in 12.18% of
our issued share capital.

LETTER FROM: DIPLOMA PLC



LETTER TO: DIPLOMA PLC

DATED 10 MAY 2002

DIPLOMA PLC (THE 'COMPANY') - SEDOL 0182663

This notification supersedes our previous notification to you dated 8 January
2002 and is prompted by sales totalling 200,000 on 9 May 2002.

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
     CGNU 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 2,757,441 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 Appendix below: Morley Fund Management Limited.

2.   Notification on behalf of CGNU plc.

2.1  We hereby notify you on behalf of CGNU plc that immediately after the time
     when the obligation to make this notification arose CGNU plc were 
     interested in 2,757,441 shares giving the CGNU group a total percentage 
     interest in the shares of 12.18%.

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 Appendix below: CGNU plc.


LETTER FROM: CGNU PLC



The Company Secretary                                      10 May 2002
Diploma plc         


APPENDIX:  MOLEY FUND MANAGEMENT LIMITED


REGISTERED HOLDERS                 NUMBER OF SHARES HELD


BNY Norwich Union Nominees Ltd     1,013,054  (Material)

Chase GA Group Nominees Ltd          722,370  (Material)

CUIM Nominee Ltd                     685,117  (Material)

RBSTB Nominees Ltd                    75,529  (Material)

Vidacos Nominees Ltd                 261,371


TOTAL PERCENTAGE INTEREST OF MORLEY FUND MANAGEMENT LIMITED: 12.18% 

ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911



 
The Company Secretary                                      10 May 2002
Diploma plc

 
APPENDIX: CGNU PLC 


REGISTERED HOLDERS                 NUMBER OF SHARES HELD


BNY Norwich Union Nominees Ltd    1,013,054   (Material)

Chase GA Group Nominees Ltd         722,370   (Material)

CUIM Nominee Ltd                    685,117   (Material)

RBSTB Nominees Ltd                   75,529   (Material)

Vidacos Nominees Ltd                261,371

 
TOTAL PERCENTAGE INTEREST OF CGNU PLC: 12.18% 

ISSUED SHARE CAPITAL ON WHICH THIS NOTIFICATION IS BASED: 22,647,911



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