DIPLOMA PLC

                                           12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX

TELEPHONE: +44 (0)20 7549 5700

21 May 2021

DIPLOMA PLC

NON-EXECUTIVE DIRECTOR APPOINTMENT

Diploma PLC, the international group supplying specialised products and services to a wide range of end segments, is pleased to announce the appointment of Dean Finch as an independent Non-Executive Director of the Company with effect from 21 May 2021.  Dean will also be a member of each of the Audit, Remuneration and Nomination Committees from that date.

Dean is currently Group Chief Executive of Persimmon PLC and is an experienced senior executive with a strong commercial, financial and operational track record spanning a 30 year career in Europe and North America. Dean is also a qualified chartered accountant.

Dean was the Chief Executive Officer of National Express Group plc from 2010 to 2020, and during his tenure built the business into Britain's leading transport group. Prior to that Dean was Group Chief Executive of Tube Lines and Group Finance Director and Group Chief Operating Officer at FirstGroup plc, where he also held a number of other senior roles.

John Nicholas, Chairman, commented:

"Following a comprehensive externally-facilitated search process, we are delighted Dean has accepted our invitation to join the Board. Diploma and its Board will benefit greatly from Dean's business and operational experience over the years ahead and I look forward to working with him."

There are no other details that require to be disclosed in respect of Rule 9.6.13 of the Listing Rules.

For further information, please contact:

Further information on Diploma PLC can be found at www.diplomaplc.com

LEI: 2138008OGI7VYG8FGR19