I've had good success with Hot Collection, although I know they get bashed here for photoshopping and high price. I've had four solid experiences over the past two years. In fact I'd say one of the punts was possibly the best OWO I've ever had and another was the most passionate shag I've experienced with a pro. I also stay near Euston and I've never had to go more than a few tube stops to an outcall destination.