Yet another thread about door-to-door salespeople I'm afraid.
I got a ring on the doorbell while I was in the middle of making the children's tea and went to answer it. The guy said (very politely, to be fair) "Hello, sorry to bother you on this dark and rainy night but I'm from Anglia Home Improvements and..." At this point I interrupted so we didn't waste each others' time further and said (also politely) "I'm sorry but I don't buy at the door."
It was like a switch had been flicked. He spun on his heel and left, shouting (grumpily) over his shoulder "Well put a sign on your door then!"
He made it sound like I was at fault for wasting his time by failing to put a sign up saying No cold callers, etc. I am seriously thinking of trying to buy a sign now, though, so he certainly made his point...