As many as 221,000 housing association tenants could exercise their right to buy if the Tory manifesto policy is implemented.

The figure comes from the National Housing Federation, which believes that this is the number of tenants who would be both eligible and able to afford to buy their homes.

Those eligible must have lived in their homes for three or more years before they can buy at a 35% discount.

The NHF says under the three-year rule, 850,000 are eligible.

Of those, it calculates that 221,000 households could afford to do so, based on a mortgage of three and a half times salary with a 5% deposit.

The NHF further calculates that this level of take-up would cost £11.6bn.