I agree with all of the above and I've sarged everywhere from Eastern Europe, Germany to California.
Comparing other countries to places like Bristol, Liverpool, Manchester and Nottingham etc., there is definitely more bitchiness here than anywhere else; but it's not impossible to pickup, you just need to isolate and be persistent. The key is to either disarm the bitch with a back-handed compliment or throw the insult back at her in a playful way... eg. "Wow, we've only just met and you already want to wank me off?

" - The key is you want to build tension so that she either throws a drink in your face or starts snogging you
British people are extremely territorial and follow the herd mentality of their crowd. A common rejection I get is 2 girls pretending to be lesbians. Or the ugly fat jealous mother hen coming at me with an attitude befitting her looks while trying to protect her fit mates because her needy fadge is as untouched and as dry as Ann Widdecombe's.
Try to isolate the girl you like, e.g. take her to the bar, casually follow her to the toilet, catch her on a fag break, chat her up in the queue before her bitch shield is up etc. Most girls in a gang reject you cos their mates are there posturing and generally being bellends. Take her away from her mates and she won't be as bitchy. Also helps if you have girls in your group, then it doesn't seem like they're being approached by a sausage-fest of tossers.
Remember the cheaper and chavvier the club, the more bellends and bitches you're gonna get. It's worth paying a tenner minimum entry just to ensure the quality and manners of the totty is high.