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

22 September 2011

DIPLOMA PLC - DIRECTORS' INTERESTS IN SHARES

Diploma PLC has been notified today that Mr I Henderson, a Director of the Company, has purchased 10,000 ordinary shares of the Company at 290.0 pence per share. As a result of this transaction, his beneficial interest in the shares of the Company has increased to 445,031 shares.

For further enquiries please contact:

Nigel Lingwood, Group Finance Director 020 7549 5705