But don't know these sources personally.  Here's some comments on London gals from from a well-known and respected hobbyist who doesn't frequent TER, but goes to London on a regular basis.  Hopefully this will be helpful.

Post 1:

Then there is a UK, a premium meat market that it is catagorized per nationality; a very define, structure market. The highest earners are Polish, and British girls that can demand $600-$1,500 per hour and I tell you that I had a Polish model which was INCREDIBLE and same with British models. The Asian in UK are typically priced not more than $300 and Eastern European (except Czeck, and Hungrian) are priced frm $200 to $350 max. The nasty factor belong to Spanish (not Brazilian, many Brazilian in UK) are famous for Anal, CIM, and almost anything that goes. talking about Spanish and Brazilian girl, funny thing is that when I was in Spain, I had the worst session in Spain with Brazilian girl and the worst session again with different Brazilian girl in Spain again!!! The worst reputation are for American girl: According to two agencies, they can't even book the American girls. There is a saying in UK: "Good girls go to heaven, BAD Girls go to London".

In general, Eastern European girl knock every nationality off the chart, way of the chart!!! I had 3 British girls in UK, one at $600, one at $800, and one at $1,400 and I tell you they were all 9, and 10 but the one at $800 stayed about 4 hours past the time and she was amazing. Service with all these girls were 10 and everything was on menu, yes, EVERYTHING. I can't even count in my head how amny Czeck girl, Hungrian, and Eastern Eurpopean girls I have had in 2002-2004, I would say at minimum probably over 50 different ones but less than 80.

Two top agencies in UK and a mediocare agency (pasha) are:
www.uk-glamourgirls.com
www.valentinesoflondon.com
www.pasha.co.uk

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Post 2:
"London (if you average it out, they offer from $$ to $1,500, however the London scene is very much categorized by nationality. The most expensive escorts tend to be from Poland, Czech models, and Swedish models (I am really referring to real model, not WANT BE models!!!)

Here is the example of three typical price range agencies:

1) http://www.asian-escorts-london.com

Middle of theroad agency:

2) http://www.aprov.com

Semi high end agency

3) http://www.uk-glamourgirls.com

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Post 3:

http://www.pasha.co.uk/cgi-bin/gallery/index.cgi?a=p
His comment: "I have seen Vicki and she was amazing..."
http://www.aprov.com/london-escorts.htm "where I met Leila in Germany last year"
http://www.citybutterflies.com/
http://www.bondandmayfair.com/escortgallery.htm "where I had a pleasure of meeting Suzie and Lucy in one day"

I saw a lovely woman, serena. Easy to hook up with.A pleasure I hope to repeat.

London is great place to Hobby. The laws are a lot less restrictive than the US so the girls operate out in the open. I have had some wonderful experiences in London. Most of the providers have incalls that are convenient to the tube system. The sites that have already been listed are good. I highly recommend www.bestescorts4u.com  This agency has always come through for me. One of my ATF is Michelle from the agency (Her pictures don't do her justice) They have a large selection of girls that will appeal to almost all tastes. Most are GFE++. Prices are comparable to DC to somewhat pricer ie 150-250 pounds (~$250-450) with lots of talent at the lower end. I would spend some time surfing (google London Escorts) and you will find no lack of girls that you will want to see. I had a week long trip to London back in March and had a short list of about 20 providers of which I manged to see 6.... alas to many to see and not enough time or cash. I will be going back in spite of recent events.