Video footage shows emergency services at Wells Cathedral in Somerset after a woman fell 30ft inside the cathedral's bell tower.
The 60-year-old became trapped between two walls 150ft up before she was winched up to the roof by fire crews and airlifted to safety in a helicopter.
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The PM promises to double to 200,000 the number of homes built under an existing scheme aimed at easing Britain's housing shortage.
The Met Office has weather warnings in place for snow and ice until 10am in the north and west.
The plan, which would effectively strip banks of the benefit of recent corporation tax cuts, forms part of the party's election manifesto.