Porvair Regulatory News (PRV)

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached:

Porvair Plc

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

Due to in-specie transfer between funds

 X

3. Full name of person(s) subject to the notification obligation:

 Prudential plc group of companies

4. Full name of shareholder(s) (if different from 3.):

M&G Group Limited

M&G Investment Management Limited

M&G Limited

M&G Securities Limited

5. Date of the transaction and date on which the threshold is crossed or reached:

 25 August 2011

6. Date on which issuer notified:

 30 August 2011

7. Threshold(s) that is/are crossed or reached:

 See item 13

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

 GB0006963689

6,080,987

6,080,987

6,080,987

6,080,987

 0

 14.33

 0

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/ConversionPeriod

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate

Exercise/Conversionperiod

Number of votingrights instrumentrefers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

 6,080,987

 14.33

9. Chain of controlled undertakings through which the voting rights and/or thefinancial instruments are effectively held, if applicable:

 Prudential plc (parent Company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)

M&G Investment Management Limited (wholly owned subsidiary of M&G Limited)

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

 N/A

12. Date on which proxy holder will cease to hold voting rights:

 N/A

13. Additional information:

 M&G Securities Limited (wholly owned subsidiary of M&G Limited) has gone above a 14% notifiable interest triggering this notification

14. Contact name:

Chris Tyler

15. Contact telephone number:

 01553 765 500