Depends where you go in London.
If you're in the tourist areas, you'll be hard pressed to actually find any English girls. So don't go centre of zone 1.
Unless your after a fat-slapper Sharon type, just be clean and
not overdressed (the non-trashy English women dress up for work, and dress down to go out - there's a clue for you, depending on the type you're interested in). Wearing sports gear or a football shirt if you're not actively playing a sport will flag you up as a pillock, or worse, a chav.
Avoid gangs, they're out for one reason only - to get absolutely plastered. Stick to bars, avoid clubs.
Tell them about where you're from, as Islanders most English people love to hear about different cultures.
Of course, if you're just looking for an easy ride, do the opposite of everything I've just said.
TL;DR: They're probably not that much different from women the world over.
Ignore Wittl and Kyle's uninformed comments.