Holding(s) in Company

Diploma PLC
07 June 2006



     FOR IMMEDIATE RELEASE                                7 June 2006

     Dear Sirs

     We received a letter today from Slater Investments Limited notifying us of
     their interest in 780,201 shares, representing 3.44% of the Company's
     issued share capital.

     Yours faithfully

     NP Lingwood
     Company Secretary

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