Instead of blowing your wad on one "high end girl" i would spend the same amount of money on ten UKP London "darlings", starting in alphabetical order with:
Adele - book three hours for the full soapy slippery experience
Ameera
Cindy
HTF - good looking black girl or you could try Jasmine Webb if you want to spend more and have serious attitude
London Lucy - who will give you a good beating
Michelle Independent
MissKDD
Naughty Mel - book at least two hours or you will be rushed - you can afford it :-)
STACY NICE SUMMER a fit older woman just to show you that good service does not have to come with a high price tag
TS finally finish off with a post-op TS
You are going to have to do a little bit of work to find the links and read the many, many reviews.
i have "sampled" all the above and they are all different experiences. After seeing all the above you will IMHO have had a better experience for the same money.
Now, go on, get on with it and let us know what you thought after each one. Oh and YMMV.
Girls, treat him well.