Holding(s) in Company

Porvair PLC
29 April 2008


TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

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

Porvair plc

2. Reason for the notification (please state Yes/No): (   )
 
An acquisition or disposal of voting rights:                               X
 
An acquisition or disposal of financial instruments which may result 
in the acquisition of shares already issued to which voting rights are 
attached:                                                                  

An event changing the breakdown of voting rights:                          
                                                                           
Other (please specify) :                                                   

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

HBOS plc

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

See Section 9

5. Date of the transaction and date on which the threshold is crossed or reached
if different) (v):

25 April 2008

6. Date on which issuer notified:

28 April 2008

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

Indirect increased to above 5%
 

8. Notified details:

A: Voting rights attached to shares
 
Class/type of shares            Situation previous to  
if possible using the           the Triggering         
ISIN CODE                       transaction (vi)       
                       Number of shares       Number of voting Rights 
                                              (viii)                  
                                                                      
Ord 2p Shares          N/A                    N/A

ISIN
GB0006963689                                                                      
 

                     Resulting situation after the triggering transaction (vii)

Class/type of shares Number of shares  Number of voting rights    % of voting rights  
if possible using                      (ix)                                           
the ISIN CODE                                                                         
                     Direct            Direct (x) Indirect (xi)   Direct    Indirect  
                                                                                      
Ord 2p Shares        N/A               N/A        2,043,309       N/A       5.021%

ISIN
GB0006963689                                                                                                            
                
                                                                                      


B: Financial Instruments

Resulting situation after the triggering transaction (xii)

 
Type of     Expiration Date  Exercise/Conversion Number of voting     % of voting     
financial   (xiii)           Period/ Date (xiv)  rights that may be   rights          
instrument                                       acquired if the                      
                                                 instrument is                        
                                                 exercised/                           
                                                 converted.                           
                                                                                      
                                                                                      
N/A
 

Total (A+B)
Number of voting rights       % of voting rights 

2,043,309                     5.021%                   


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

Insight Investment Management (Global) Limited* ('IIMGL') - (Indirect) -
2,043,309 (5.021%)

IIMGL manages holdings on behalf of other HBOS Group companies, and other third 
parties external to the HBOS Group, under various discretionary management 
agreements.

(* - wholly owned subsidiaries of HBOS plc.)



Proxy Voting:
 
10. Name of the proxy holder:            N/A
 
11. Number of voting rights proxy        N/A
holder will cease to hold:

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



13. Additional information:              Notification using the total voting
                                         rights figure of

                                         40,698,416

14. Contact name:                        Kenny Melville

15. Contact telephone number:            0131 243 8671


 



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