London Mayor Boris Johnson has thanked Andy Hunt on Twitter, following the British Olympic Association and Chef de Mission for Team GB's announcement he is to step down.
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Fire services are spending thousands on the 25-stone models - nicknamed 'Barry' - to learn how to handle larger patients.
Ahmed Hassan, 18, has been charged with attempted murder and causing an explosion with intent to endanger life.
A growing number of rank and file officers say they support being routinely armed while on duty in the wake of terror attacks.