Holding(s) in Company

Porvair PLC
17 March 2005


LETTER TO:  RNS

               SECTION 198 COMPANIES ACT 1985 - 3% NOTIFIABLE INTEREST

We were advised today that F&C Asset Management plc have an interest in
4,448,142 shares which are held as portfolios managed by them on a discretionary
basis for clients under investment management agreements.

This interest represents 12.09% of the Company's issued share capital.

From:  Chris Tyler (Company Secretary, Porvair plc)

                      This information is provided by RNS
            The company news service from the London Stock Exchange