Holding(s) in Company

Diploma PLC
30 June 2004


                                  DIPLOMA PLC
                        20 Bunhill Row, London EC1Y 8UD
              (Registered in England No. 3899848 at above address)

Telephone: [phone] Fax: [phone]



FAX to: Company Announcements Office, London Stock Exchange



30 June 2004

Dear Sirs,

We enclose a copy of a letter received today from UBS Global Asset Management
Life Ltd has an interest in 1,070,582 ord 5p shares of the Company. This
represents their interest in 4.72% of our issued share capital.


Yours faithfully

Nigel Lingwood


Company Secretary




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