Holding(s) in Company

Diploma PLC
9 October 2003

LETTER TO:  DIPLOMA PLC

Companies Act 1985 (as amended) ('the Act') - Disclosure of Interests in Shares

In accordance with Part IV of the Act, we write to inform you that Platinum
Investment Trust Plc yesterday purchased 45,000 ordinary shares in Diploma plc. 
Our total holding is now 715,000 shares which we believe represents 3.157% of
the current issued ordinary share capital.

The registration details of the holding are as follows:

Bank of New York Nominees Ltd, account number 310008.

From:  Platinum Investment Trust Plc

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