ive paid a grand for worse, tbh. have fucked hundreds of hookers.
check the prices on this place... girlsfromparadise.com
some don't even specify price, you just kinda have to shower them with infinite wealth/gifts/cars/houses/whatever. i know a girl who charged a dude 80 grand (albeit USD, not GBP) for one weekend together. he bought her tickets, she flew to the u.s, 3 days later she was back and had like £50k to spend.