I was once given an appalled look by a friend that I never (even thought of it) tipped my pizza delivery boy! Now I am feeling worried I am doing my lovely Tescos delivery men (who are very reliable, helpful, chatty, pleasant etc) a disservice by not tipping them!
However, isn't this a cultural thing? I remember a German taxi driver telling me the british were the worst at tipping, and the Americans the best! It's very much in the American culture (so I believe) to tip at every given opportunity!
However, you probably "are not allowed" but I will make sure to make my Tescos chaps a christmas card with something in it now although there are several, and where will it all end I wonder!
However, I'm not tipping bloody "we're on a contract from the council, and won't take your bin if it's been moved five yards from it's designated position" bin men any more. Bastards.
And they broke my gate with their lorry.