I'm always suspicious of 'new' agencies that have completely different girls, and also look amazing. Add to that a £100 ph fee you get a potential scam.
I remember some years ago there was a ButterflyTouch Agency that had £80 prices. They wanted pay online and they'll send the address. The girls were normal London escorts. I bet they actually make the booking and when you turn up the WG will say they know nothing about having already paid. The address turned out to be a jewellers in Bond Street! (from my Googling).
Sonya and Brianna I'd like to see if they're real. Or are they list elsewhere?
If real I expect you pay extra for everything.