The main character acted in a daytime soap/drama and played a cop but he starts wearing the uniform out of work and begins to believe he is a real cop, trying to arrest people and getting free blow-jobs off hookers etc.

Spoilers – the final scene sees him crying, watching TV and downing a bottle of something alcoholic and he then blows his own brains out with a hand gun….cheerful sounding I know but it was a great film about a man’s psychological descent into madness and isolation.

All I can recall is a large weird gnarled tree/plant that was inside a living room and not much else unfortunately (it may have been an anthology but .  It was on British TV during the 80’s and I have not seen it since……