I am not English, but as far as I know prostitution is legal, isn't it? if correct, no need to worry about paper trail. 
Ok, so you don't have a wife / significant other or family that might frown upon your use of paid sex?
You are not worried that some fraud will be committed once they have your details?
What's your reason for wanting to do so?
Do you want to get sex on credit, build up your air miles?
Or are you hoping that you can have some credit sex then report your card as stolen?..... That's another reason why a WG would be highly unlikely to take it.
I don't think you will find any genuine WG in the UK that will take your plastic, and if you did find someone, they would probably have a nefarious ulterior motive for accepting it.
Ming
