What is this film?! British black comedy?

I watched a film the other day and just can't remember what it was called.

I think it was a British film and it was a black comedy.

There was a man in his flat and basically everyone who entered his flat died from some kind of accident e.g. a chandelier falling on their head, a sash window cutting someones head off, someone falling off a stool and a screwdriver going through their neck. And also the dog died.

It looked like all of these had been murders even though they were actually accidents!

Please someone help!

Thanks :)