Shelley the tortoise celebrates her 10th anniversary on the programme, and is visited by a vet as she prepares for hibernation. Radzi Chinyanganya and Lindsey Russell take on a mountain bike challenge along a Commonwealth Games track, and Barney Harwood learns how the Thames Barrier helps to protect London from tidal surges.

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  • Episode Number 4825
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  • Originally Aired Thursday, October 16, 2014
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  • Last Updated By aznewsh
  • Last Updated 01/09/2015 9:06pm