Director/PDMR Shareholding

Diploma PLC
14 March 2008



                                         12 CHARTERHOUSE SQUARE, LONDON EC1M 6AX
                                                  TELEPHONE: [phone]
                                                  FACSIMILE: [phone]
                                                                                

    FOR IMMEDIATE RELEASE

                                                                   14 March 2008

                  DIPLOMA PLC - DIRECTORS' INTERESTS IN SHARES

    Diploma PLC, the international group of specialised distribution businesses,
    has been notified today that Mr Iain Henderson, a Director of the Company,
    has disposed of 18,875 ordinary shares of the Company at 166.0 pence per
    share and has acquired a further 39,875 ordinary shares of the Company at
    167.0 pence per share, following transactions carried out yesterday.



    For further enquiries please contact:


    Nigel Lingwood, Group Finance Director 020 7549 5705




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