Chancellor of the Exchequer Darling and Business Secretary Peter Mandelson will tell bank chiefs that they must help small firms through the recession.
Major banks RBS, HBOS and Lloyds TSB were all helped by the government's 37 billion pound (S$90.1 billion) bailout this month.
As a condition of the deal, the banks must continue lending at 2007 levels, but many firms complain that loans are harder to obtain and that recent terms offered by banks have worsened.
Mr Mandelson, the former EU trade commissioner, told lawmakers this week that banks must show greater 'discretion and sensitivity' when dealing with small companies.
He said there was evidence that smaller companies were being asked for higher interest payments on loans, and being asked for extra charges.
The British Chamber of Commerce's director general David Frost told the BBC that firms were finding it increasingly difficult to access funding.
'The cost of money is undoubtedly higher than it was and we see no evidence of it coming down,' said Mr Frost.
'Banks are charging for services that were previously parts of the deal.
'And the idea of relationship banking is breaking down. Everything is going through regional offices and it is taking much longer to get the okay on a loan or an overdraft.' -- AFP