Hot Collection advertises girls who are on a lot of other EE agency sites, I have seen and can personally recommend:
Gorgeous + great service: Lucia, Caroline, Zuza, Rubina, Celine & Amanda - as good/better than photos
Good looking + great service: Dalia, Macy, Raisa, Mona, Jasmin, Lena, Orla
This selection all resemble the photos which have been enhanced as per usual but the girls in the first list are proper head turners in the flesh.
Please note, this is my go to EE agency and I've been using them a long time.
Good luck and hope you enjoy your visit to London.