In his innocence, Godber is looking forward to Christmas, but Fletch just wants a quiet sojourn in the prison hospital. As he says: "there's one big event round here, it's not the coming of the Lord - it's the tunnelling of Tommy Slocombe". Just as Fletcher's 'old knee injury' wins him a trip to the local civilian hospital for a full check up and x-ray, genial Harry Grout decides to call in a favour.