I wouldn't worry about him coming after you, if he didn't punch you then and there it's extremely unlikely he will in the future.
If it were me I would just put it down to one of those things that happens living in London, probably just wanted to look the big man in front of his wife/girlfriend/mother. On the other hand it would be nice if you could persuade a policeman to pop round and explain his behavior is not acceptable. I doubt they would actually prosecute him but it might be enough for him to know his card is marked.
I wouldn't worry about him coming after you, if he didn't punch you then and there it's extremely unlikely he will in the future.
If it were me I would just put it down to one of those things that happens living in London, probably just wanted to look the big man in front of his wife/girlfriend/mother. On the other hand it would be nice if you could persuade a policeman to pop round and explain his behavior is not acceptable. I doubt they would actually prosecute him but it might be enough for him to know his card is marked.