Crack-Up is the 356th episode of The Bill.
Reg is in a pawn brokers when a man wearing a hat, scarf, and glasses leaves carrying a bike helmet leaving behind a bag with a gun in it. The shopkeeper calls CID as he thought he was going to be held up. The gun is thought to be linked to the shooting of a P.C. Reg brings in a drunk for criminal damage but when asked to remember the man in the pawn brokers he can't. After being told about how close he was to being gunned down he talks to Sgt. Cryer.