Doctor in the House S05E15 - Watch Out - There's a Thief About

Items are going missing from around the hospital, arousing suspicions that they are being stolen and sold to hotels - until an electro-cardiograph machine goes walkabout. A recently flush Duncan becomes the prime suspect and an eager Bingham pulls all the stops out to catch the thief, but cries wolf so often that nobody believes him when he actually rumbles the culprit.