Net Asset Value(s)

British Portfolio Trust PLC
19 December 2006



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 December
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 186.29p.

2)  based on the market value of the company's fixed interest rate swap
contracts, the capital net asset value per ordinary share was 186.21p and

3) based on the number of shares held in treasury, the net asset value per
ordinary share was 185.85p.

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



Enquiries:
Peter Ingram
Tel: [phone]
19 December 2006





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