Net Asset Value(s)

British Portfolio Trust PLC
06 September 2006



British Portfolio Trust PLC

As recommended by the AITC, financial assets are now valued on a bid price basis
in accordance with revised UK accounting standards.

British Portfolio Trust PLC announces that at close of business on 5 September
2006:

1) Excluding any profit or loss on the mark to market value of the company's 
   fixed interest swap contract, the capital net asset value per ordinary
   share was 178.14p

2) based on the market value of the company's fixed interest rate swap
   contracts, the capital net asset value per ordinary share was 178.00p; and

3) based on the number of shares held in treasury, the net asset value per
   ordinary share was 177.77p.



The market value of the company's fixed interest rate swap contracts is updated
monthly.


Enquiries:
Peter Ingram
Tel: [phone]
6 September 2006




                      This information is provided by RNS
            The company news service from the London Stock Exchange
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