In the novel The Floating Admiral, Bancock is a policeman who assists Inspector Rudge in his investigation of Admiral Penistone's murder.
Bancock is described as being "a very stout man". He poles the Vicarage punt across the river for Peter Mount, but according to Peter, he is not very good at it.
Bancock is left on duty at Rundel Croft, so that Inspector Rudge is free to leave if he wants to.