Celebrity Traitors finale: Joe Marler bumps his head during last challenge

Joe Marler repeatedly bumps his head on the lid of a crate, while looking for gold and keys, during a chaotic last challenge on the finale of BBC's Celebrity Traitors.Meeting Claudia Winkleman at a train station, a steam train pulled up in front of the players where they had to board the five carriages.Some of the crates there were explosives and the stars only had 20 minutes until the train reached the end of the line.