A group of the largest US hedge funds has called on the Bank of England to intervene to free an estimated $65bn (£38bn) in assets frozen in London in the collapse of Lehman Brothers, warning that delays “could be disastrous for UK plc”.

The funds, through the Managed Funds Association, said the scale of the problem was so great that it could undermine bank rescue plans as tens of billions of dollars would be kept out of the market. It was also likely to lead to the failure of some fund managers, said Richard Baker, chief executive of the MFA.