Holding in Company

Diploma PLC 19 April 2001 LETTER TO DIPLOMA PLC - DATED 17 APRIL 2001 Pursuant to Section 198 of the Companies Act 1985 (the 'Act') we hereby notify you that: (a) Oryx International Growth Fund Limited ('ORYX'), PO Box 208, Bermuda House, St Julian's Avenue, St Peter Port, Guernsey CI is a party to an agreement to which section 204 of the Act applies (the 'Agreement'). The other party to this agreement is: J O Hambro Capital Management Limited ('JOHCM'), Ground Floor, Ryder Court, 14 Ryder Street, London SW1A 6QB. (b) As at 17 April 2001, ORYX was interested for the purposes of the Act in 300,000 ordinary shares in the relevant share capital, as defined in section 198(2) of the Act, of Diploma PLC (the 'Relevant Shares'), which represents 1.19% of that class of capital based on an issued share capital of 25,164,000 ordinary shares. (c) 1,225,000 of the Relevant Shares are shares in which ORYX will be interested by virtue of sections 204 and 205 of the Act. (d) The Relevant Shares are held or will be held in the following names: HSBC Global Custody London Limited 300,000 Goldman Sachs International TNA 168,000 Goldman Sachs International THO 117,000 Goldman Sachs International TEU 585,000 Goldman Sachs International THT 55,000 TOTAL 1,225,000 shares = 4.87% FROM ORYX INTERNATIONAL GROWTH FUND LIMITED

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Diploma (DPLM)
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