Women in the UK, especially the nightlife type, are not easy to get anything with if you don't already know them.
@Unknownuniverse and I were having this conversation in his thread. The Anglosphere and North America are two completely different cultures.
In the USA, things are more equal and fair between the genders to the point where I have read stories of door staff actually encouraging guys to approach. In the UK and common wealth, things are optimised for women more than men, so if you do an approach which is slightly cringe, you will be asked to leave immediately.
I went to Manchester for daygame and nightgame. I booked the club (Factory 251) and was not allowed in as a single male, so I didn't even experience the club there but I have no reason to believe it would be any different to my part of the country.
I tried a couple of approaches out on the streets but didn't get anywhere.
I would like a American to come to the UK and try approaching, I would suspect it would be a rude awakening, but I could be wrong.