If you haven't already, pick up a copy of Watching the English from your nearest bookshop. It's an attempt by a professional (English) anthropologist, Kate Fox, to analyse the English and English behaviour.
While it's a bit repetitive, she does manage to make explicit most of the implicit rules of social behaviour in English society. This is sometimes amusing, mostly enlightening and occasionally irritating, mainly when she highlights things you've already noticed. It is well worth a read, particularly if you're English and think that some of your behaviour is “natural” and the “way everyone is”. Is should also help foreigners avoid making various faux pas and help English readers be more tolerant of those that do.