Holding(s) in Company

Porvair PLC
22 November 2005


             Companies Act 1985 - Disclosure of interests in shares

We were advised today of the following holding by Prudential plc and certain of
its subsidiary companies:

Interested Company                     Ordinary shares         % holding
Prudential plc                         6,055,987                14.96
M&G Group Limited                      6,055,987                14.96
M&G Investment Management limited      6,055,987                14.96 
M&G Limited                            6,055,987                14.96
M&G Securities Limited                 5,320,632                13.14





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