Holding(s) in Company

Porvair PLC
31 August 2005

Letter to: RNS

SECTION 198 COMPANIES ACT 1985 - 3% NOTIFIABLE INTEREST

We have been advised of the following holding by Coal Pension Trustees and 
certain of its subsidiary companies

Registered owner               No. of shares               % holding

Mineworkers Pension Scheme     1,100,000                   3.02
(Chase GIS) Nominees Ltd

Letter from: Chris Tyler
             Company Secretary

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