Net Asset Value(s)

British Portfolio Trust PLC
19 February 2008

British Portfolio Trust PLC



As recommended by the AIC, 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 18 February
2008:

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 174.24p.

2)      based on the number of shares held in treasury, the net asset value per
ordinary share was 173.87p.



The NAV at market value will no longer be announced as the fair value of the
interest rate swap contracts is now recognised in the financial statements in
accordance with the adoption of FRS26 'Financial Investments: Recognition and
Measurement'.



Enquiries:

Peter Ingram

Tel: [phone]

19 February 2008



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