There is a chap in the New England Siansbury's on the till who has a flaky scalp, chewed fingernails, a big spotty red nose and bogeys falling out of his nostrils. Politest man you could hope to meet. It's a mad, mad, mad, mad,mad,mad, mad, mad, mad mad,mad, mad,mad,mad, mad world.
Manners are good. Over politeness is a bore though. In a supermarket I couldn't give a tinker's **** what the till jockey is like as long as they're not outright rude. In a restaurant or pub I expect a more polite, cheery disposition from the help but it doesn't ruin my day if I don't get it...