And when the police arrived they found the ends of cannabis cigarettes in an ashtray, and Mr Kemp ended the night being interviewed about the drugs by Scotland Yard drugs squad men.
He said afterwards: “It all happened after I returned from the premiere – and it was the worst night of my life.
“I called in the police in the first place because I genuinely thought a man was trying to murder me – a man had too much to drink and just went beserk.
“I was covered in blood and in a terrible state when I barricaded myself in one of my rooms and called Scotland Yard from an extension after the main phone had been tom out from its socket.
“I’ve gone through an awful experience – confronted with a hammer and cut about the body. I had also seen my flat wrecked.
“By the time the police arrived it had quietened down and there seemed no cause for alarm.
“Then the police spotted about half-a-dozen roaches (cannabis dog-ends) in an ashtray.
“I told them I certainly hadn’t smoked them. In fact I’m not at all interested in drugs myself, although I don’t disapprove of people smoking cannabis, which I consider far less harmful than alcohol.”