Director Declaration

DIPLOMA PLC

12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

FACSIMILE: +44 (0)20 7549 5715

FOR IMMEDIATE RELEASE

23 January 2018

DIPLOMA PLC

DIRECTOR DECLARATION

The Company has been informed today that:

1. Bruce Thompson, the Company's Chief Executive Officer, has been appointed as a Non-Executive Director of discoverIE Group plc, a company listed on the London Stock Exchange, with effect from 26 February 2018; and

2. Anne Thorburn, a Non-Executive Director and Chairman of the Audit Committee, has been appointed as a Non-Executive Director of BTG plc, a company listed on the London Stock Exchange, with immediate effect.

For further information, please contact:

LEI: 2138008OG17VYG8FGR19