DIPLOMA PLC

                                           12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

FACSIMILE: +44 (0)20 7549 5715

FOR IMMEDIATE RELEASE

23 March 2017

DIPLOMA PLC - DIRECTOR'S INTEREST IN SHARES

Diploma PLC (the "Company") has been notified that on 22 March 2017, Mr BM Thompson, Chief Executive Officer of the Company, disposed of 7,350 Ordinary Shares at £10.445 per share and has acquired through a personal savings vehicle, 7,350 Ordinary Shares at £10.445 per share.

BM Thompson's beneficial interest in the shares of the Company remains unchanged at 745,000 Ordinary Shares, representing approximately 0.65% of the Company's issued share capital.

The notification set out below has been made in accordance with Article 19 of the EU Market Abuse Regulation.