Palace of Westminster rooftop
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£3bn bill to fix crumbling Palace of Westminster

20 November 2014 Last updated at 23:17 GMT

Taxpayers may have to spend more than £3bn to stop the Palace of Westminster turning into an unusable "ruin", the BBC has learned.

Over the years the building has been damaged by fires and floods, and some of the stonework has been altered beyond recognition.

Much of the infrastructure has not been updated since the 1950s.

Newsnight's Laura Kuenssberg reports.