Just had a man knock on the door saying that he's a tree surgeon, and has noticed that the tree in our front garden is dangerous and needs to come down urgently, and that he could do it for us for cheaper than anyone else. I told him that we'd had the tree assessed professionally last week and it was fine; he got annoyed and left.
Obviously this is a scam, but is it worth bothering 101 with? We have quite a lot of elderly people near us who I'm worried might be convinced by him.