Holding in Company

Diploma PLC
27 March 2001


LETTER TO: DIPLOMA PLC

In accordance with the provisions of the Companies Act 1985 and the Disclosure
of Interests in Shares (Amendment) Regulation 1993, I am writing to advise you
of the following transactions affecting the notifiable interest of Unicorn Asset
Management Limited in your company:

Eaglet Investment Trust plc                 2,593,393
(held HSBC Global Nominees Ltd a/c Eaglet)

Acorn Income Fund Limited                     395,365
(held Forest Nominees Limited a/c GCA15)

Premier UK Small Companies Fund               141,250


Unicorn Asset Management Limited has a notifiable interest in 3,130,008 shares
in your company representing 12.44% of shares of this class.  This interest
arises purely from the status of Unicorn Asset Management Limited as investment
manager to the above two companies.  Unicorn Asset Management Limited is not the
beneficial owner of the shares and should not be identified as such.

LETTER FROM: UNICORN ASSET MANAGEMENT LIMITED