HHG,
If you don't mind booking for min 2 hours, I have persuaded several London based ebony girls to visit me (I live near Cambridge), as it's only around 50 mins on the train, and most of them don't mind travelling the distance as it doesn't take to long.
The min 2 hour booking time made it worth their while travelling, some wanted longer, and have managed to "negotiate" a better hourly rate on occasion.