A Corporal of Horse is the 352nd episode of The Bill.
Marshall is acting sergeant with C relief. She watches one of the relief drive away in a non-police car without wearing his tunic after P.C. Smollett points it out. She tries to sort out a problem without backup from C relief's inspector, and puts P.C. Locket's career on the line. Sgt. Cryer shows Ch. Supt. Brownlow the arrest figures for C relief. Brownlow is not impressed.