Pressure is growing on the Government to scrap Right to Buy, after it emerged that councils in London are spending over £22m a year renting back homes that they once owned, to house homeless families.

According to answers to a Freedom of Information request, 42% of ex-council homes in London are now rented out privately. The figure is up from 36% in 2014.

Right to Buy in England is to be extended to social housing, with a trial in the midlands, where over 9,000 housing association tenants entered a ballot to buy their homes. The Government expects that there will be 3,000 actual sales.

In Scotland, Right to Buy has already been scrapped, in 2016, and the policy is due to end in Wales this weekend.

The latest Freedom of Information data has been published in report by Labour London assembly member Tom Copley, who said it would be “reckless” to continue with Right to Buy amid strong demand for social housing.

He said: “Something has gone very wrong when tens of thousands of homes built to be let at social rents for the public good are now being rented out at market rates for private profit, sometimes back to the very councils that were forced to sell them.”

He said some councils have bought back homes at more than six times the price they sold them for.

Housing minister Kit Malthouse defended Right to Buy, saying that since 2010, over 100,000 people had bought their homes, including 17,000 in London.

He said: “This Government is determined to make the dream of home ownership a reality for as many families as possible.”

Under Right to Buy, the maximum discount in London is £108,000; in the rest of England it is £80,900. In Wales, until this Saturday, it is £8,000. In Northern Ireland, it is £24,000.