You say you are not from UK. So perhaps your initial search for escorts in UK stumbled across agencies like
External Link/Members Only,
External Link/Members Only,
External Link/Members Only,
External Link/Members Only,
External Link/Members Only, etc, or looked at directories like
External Link/Members Only and
External Link/Members Only of independent girls with links to personal websites.
Now I would suggest you to read
this post and also become aware of
External Link/Members Only (UK section) and become familiar with its
External Link/Members Only. Many girls advertising in Adultwork use normal pictures (as requested/demanded/expected by the clients in UK). Bear this in mind when comparing them with glamourised or heavily photoshoped pictures used by agency girls.
You will soon find out (by also looking in the UKP review section) that in London there are plenty of good service providers offering a nice GFE (with proper FK) and who are also slim and good looking in almost any price range. For girls that are doing this job full time the price differentiation amongst them often depends on:
(i) how much facially pretty they are. The price structure of girls advertising in Adultwork roughly goes like this: mediocre/average: £60-£100, cute: £70-£110, pretty: £90-£130, very pretty: £110-£160, beautiful: £120-£190, very beautiful: £150-£250, gorgeous: £200+, rare beauty: N/A.
(ii) location and apartment/hotel luxury. The flat rent rates or hotel prices in some parts of London are much higher than in others. A girl servicing in a luxury apartment in South Kensington or in a 5 star hotel has a much higher overhead than say a girl in a shared shithole in Walthamstow or Northolt or Ilford.
(iii) girl’s “exclusivity”/”availability”. A higher price (justifiable by the looks or not) makes a girl less accessible to anyone – thereby she is more available/less busy than other girls in lower prices. In other words (a)she is easier to be booked and (b) by her own choice (or not) she sees only very few clients per week as opposed to 10-20 per day.
(iv) nationality. Independent beautiful British girls are more expensive than Eastern European girls.
Most members of the UK Punting forum go for good value for money (VFM) girls i.e. girls who are good service providers, slim and their price is in the lower end of the facial beauty band they belong (i.e. UKP members will go for a very pretty girl charging £110 instead of £160) and don't care much about location and almost universally not bothering at all about exclusivity (although do care about ease of booking and fast comms).
As for recommendations your question is too general. I guess you want an outcall. If it is incall then you better state the location – although I guess you will be more comfortable somewhere centrally (underground zones 1-2) rather than in regions of Greater London - still even Central London is not a small area. You also don't mention how tall you want the girl to be – petite, average height, tall (or you don't care?). Also you want her busty. How much busty? Cup DD or GG? Or is cup C also good? And what nationality? Do you want a British girl or you don't care as long as she is speaks good English? (I am assuming you want a white girl).