Houses of Parliament's Big Ben: London's tower of Pisa?
Westminster has its very own leaning tower, as St Stephen's Tower - better known for housing Big Ben - is years from collapse, it has been revealed.
Giles Dilnot looks talks to tourists about the future of the landmark, which is not expected to tumble for a few thousand years.
After the film was aired, Professor John Burland was questioned on its future.
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11 Oct 2011