+1 malvolio
4 step plan
1. you have your criteria so do an AW search. Tick the boxes for services you want and filter by nationality and age...you know the drill
2.Once you compile a shortlist, search by profile number on here to find reviews and intel.
3.At that point, if needs be, you can ask questions about specific girls, directed at people who have seen them.
4.Choose girl and punt her
Even if some fucker with an encyclopaedic knowledge of the EE market in London could throw a name or two at you straight off the bat of those criteria, you'd invariably not find out about many more who could fit the bill. So the above is a more sensible approach - although it does require you to do some work first