Generally speaking some webcam girls may say they escort, but mostly just to get you to spend lots of credits with them in private and then string you along about meeting.
I've never seen many English girls on MFC, most of them are American or Eastern European, so don't know about any who also escort.
AW has plenty of webcammers so you could always search on ones who have both the webcam and escort boxes ticked - but I wouldn't get your hopes up about meeting any.
If you want to break your punting cherry - just pick a well reviewed girl in your area that you like the look of and go see her for a half hour booking.