Just returned from London. I over did the research, assuming that the photos on sites would be mostly fake. Well, it turns out that London's main hobby sites are actual photos, provable, that many of the sp's also have videos. Also the reviews on the sites seem to be consistently good. You'll also see that they have a lot of info on looks, services provided, investment etc. So it makes thiings significantly simpler than you'd imagine.
The short take away is that while it is possible to find 30 and 45 min appointments, with associated price identified, the hour price is the comparable. So you can see that for an hour the rates start at (pounds) 150, 200, 250 and then up to very high prices from there. It is also listed on the site, which things might have an extra charge (50 or 100).
What to me what notable is that many of the women are eastern European, but model to super model looks. The photo galleries, would have you believe that they are way way to good to be true. Well, you can do image search and so on and get no duplicates, so that's good. The fact that a good number of them have videos, provides additional lighting and angles to be able to gain a full sense of who the sp is.
So you can do the math, and so for 150 pounds, have an experience with a supermodel looking woman with full preknowledge of what you're in for. I'm glad I don't live there for that reason, it would be way too tempting to over participate.
Diva has been mentioned about, Babylon, and Admiral have between 30 and 100 choices. I'd also most suggest not looking at the websites from a remote location, as it will mess up your day.
Have fun for those going over.