A flagship UK Government policy to revive the housing market has been questioned by a minister, raising fears it could lead to another property bubble.

Vince Cable, the Liberal Democrat Business Secretary, cast doubt on the Help to Buy scheme, which aims to provide equity loans of up to 20% for buyers of new-build homes in England and will part-guaranteeing mortgages for buyers across the UK from next year.

As soon as Chancellor George Osborne announced the scheme in the March Budget, fears were raised that, without a boost to the supply of housing, Help to Buy would push up prices.

Mr Cable said: "The proposal which hasn't yet been implemented, which is providing a guarantee for a limited range of mortgages, could be a problem. It could inflate the market. But, if it's properly designed, it could be a useful addition."

Under the scheme people will be able to buy a home with a 5% deposit; the UK Government will act as guarantor for a mortgage for an extra 20% of the value.