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:

 M&G Investment Funds 3

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

 Nortrust Nominee Ltd A/C MKK01 (see item 13 for details)

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:

 14%

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

5,320,632

5,320,632

6,080,987

6,080,987

 14.33%

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:

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:

With reference to item 3, M&G Investments Funds 3 is an Open Ended Investment Company (OEIC) and is not a Prudential group company and must be separately disclosed.

This OEIC Fund is managed by M&G Investment Management Limited (a wholly owned subsidiary of Prudential plc) and will have been previously attributed to Prudential plc solely on the basis that M&G Investment Management Ltd has direct fund management control over the shares identified in this notification.

Therefore the 14.33% holding being disclosed in this notification is encompassed in the 14.33% already disclosed under The Prudential plc group of companies and is NOT in addition to it.

14. Contact name:

Chris Tyler

15. Contact telephone number:

01553 765 500