Diploma Regulatory News (DPLM)

DIPLOMA PLC

12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

FACSIMILE: +44 (0)20 7549 5715

FOR IMMEDIATE RELEASE

19 July 2011

DIPLOMA PLC - DIRECTORS' INTERESTS IN SHARES

Diploma PLC has been notified that Mr I Henderson, a Director of the Company, has disposed of 7,560 ordinary shares of the Company at 374.0 pence per share and has acquired, through a personal savings vehicle, 7,560 ordinary shares of the Company at 374.5 pence per share. His beneficial interest in the shares of the Company remains unchanged at 435,031 shares.

For further enquiries please contact:

Nigel Lingwood, Group Finance Director 020 7549 5705