Welsh == Sheep Shaggers! All they do all day is shag sheep and spit when talking. NOBODY in Wales speaks Welsh UNLESS you are an Englishman on holiday, and then they ONLY speak Welsh.
Scottish == Tight fisted mean bastards who don't wear pants (underwear). All they do all day is run around the highlands tossing cabers and hunting haggis.
Irish == Not very bright, butt of all jokes, EVERYBODY is named Paddy. It used to be they all carry bombs too, but that's not very PC these days, even for the most hardened xenophobe. Whilst visiting Ireland, you are either a "caddy ba" (catholic bastard) or a "proddy cun" (protestant cunt).
English == pompous, arrogant SOB's who having nothing better to do than moan about every other fucker all day. Every other fucker would like to kick the English in the ass. The best thing about being English is "you're not one of the other 3" ...
But like the Murphy's... I'm not bitter