At risk of being branded a white knight or something saying this but...
You pay for the quality of the girl not an exact service. Is she refuses a service advertised then it's at her discretion surely? your never guaranteed any of the services are you?
Seems to me most people have a mindset that girls should always provide every service advertised and the prices should all be consistent.
£200/hour is a lot in comparison to others but worth a punt, something different for a change and if she doesn't deliver for me you can all have the last laugh.