Director/PDMR Shareholding

DIPLOMA PLC

12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

FACSIMILE: +44 (0)20 7549 5715

FOR IMMEDIATE RELEASE

11 February 2011

DIPLOMA PLC - DIRECTORS' INTERESTS IN SHARES

Diploma PLC, the international group of businesses supplying specialised technical products and services, has been notified that Mr JL Rennocks, the Chairman of the Company, has acquired 30,000 ordinary shares of the Company, following a purchase of shares yesterday at 299.25 pence per share.

For further enquiries please contact:

Nigel Lingwood, Group Finance Director 020 7549 5705