Net Asset Value(s)

British Portfolio Trust PLC
23 July 2007



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 20 July 2007:

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 197.83p.

2)      based on the number of shares held in treasury, the net asset value per
ordinary share was 197.70p.



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: Measurement'.



Enquiries:
Peter Ingram
Tel: [phone]
23 July 2007




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