So was this Celia bird working at the time? From hearing reports on Sky Sports, they just said It was an affair, she's obviously denied working as a escort.
As for finding girls like her, yes they can be found In London, no doubt many well known glamour models and actresses turn tricks, but under the radar, you know the Idea, they attend the same exclusive London venues as the rich & famous, mix In these circles and make customers.
Some of the escort agencies do say they have models like this, and no doubt some do have genuine glamour models and porn stars. My advice Is do some research, trawl AW and the London agencies, use Google reverse Image search, this will weed out the total fakes, from the genuine escorting model who mistakenly used her glamour pics for her escort pics.