Lloyds is set to post bumper profits this week as calls grow for a windfall tax on banks.

Britain's biggest lender is forecast to report net interest income – the difference between what it charges borrowers and pays savers – of £13.6 billion, up from £12.8 billion a year ago.

Other big banks are also in line to post robust results in the coming weeks as they cash in on higher-for-longer interest rates.

Between them, they make £20 billion a year from interest earned risk-free from deposits held at the Bank of England that built up during its quantitative easing money-printing scheme.

Last week, Nigel Farage, whose Reform UK leads in the polls, told the World Economic Forum in Davos banks were 'not going to get free money any more'.

He also took aim at Bank governor Andrew Bailey, who last week told MPs that there would be 'a big consequence' if interest was not paid on banks' reserves.

Farage, who is mulling a US plan for a 10 per cent cap on credit card interest, said: 'Everything is up for discussion.'