The producers said that
Heartbeat (1992) wasn't likely to last, but asked that I give Greengrass, who only had a few lines, an injection of humour. It was the easiest role I've ever played because they allowed me so much freedom with Greengrass. I got the idea for him to wear that old grey army coat from when I did The Caretaker on stage so it appeared that he had a heroic past in the military.