If you're going to post something marked 'Urgent, please do not ignore' through a letterbox, maybe spend 5 seconds to make sure you have the right house?
And they weren't even close, I live at 41, the letter was addressed to number 49, which is literally the first house in the street...
I just tottered down the road in the freezing rain to put it in the right letterbox. (So of course the rain has now stopped).
*I know it was hand delivered, because a) no stamp and b) I heard them knock and them put it in the letterbox about 6PM last night, but given at that point I'd already gone to bed because of the whole sinus bug thing and was asleep not long after I wasn't about to get up to answer the door and didn't actually see it until this morning.