There are only a few weeks left of shooting St Trinian's II: The Legend of Fritton's Gold and there are some photos of David Tennant shooting some scenes in the Thames:
David, 38, dragged himself out of the river's murky water during a scene where his villainous character, Lord Pomfrey, sinks in his boat. He then had a tussle on the shore with co-star Christian Brassington, 26.
An onlooker said: "David was in his element. It must have been freezing but he didn't seem to mind." Evil Lord Pomfrey tries to stop the St Trinian's schoolgirls from finding a stash of gold.