A right-wing think tank has suggested councils should sell off expensive houses to fund new building developments.
Policy Exchange, an influential think tank set up by Conservative MP Nick Boles - an ally of prime minister David Cameron - said the UK could afford to build 170,000 affordable homes a year by putting the highest-value properties on the market when they become vacant.
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But the think tank been accused of pushing for the poor to be driven out of wealthy areas, and Labour MP Karen Buck has said the policy doesn't make sense and would break up communities.