My current RB for a trip to London is showing that you are very correct.
I asked for British but any race, out-call, tall, slim, 25-35, and certain services.
None of the nine replies so far have managed even a close match. They have, however, all matched my price, even those that normally charge less.
I particularly enjoyed the size 16, 5ft, no pics who only provided one of my services required and that with discretion.