I highly doubt this will be a problem for long. All it takes is a text from a girl saying she is desperate for money, can they meet up and she'll do all the "weird" stuff he likes for the standard price. Have a car waiting outside the meet, girl doesn't answer door. Follow the guy home, find out where he lives, who his kids are, where his family work...then put the fear of god in him with violence and/or threats to his livelyhood.
It's not exactly complicated to solve these kind of issues.
To be honest i'm suprised he's lasted this long......i know plenty of people in brum who would do this for £500 all in, maybe less, and i imagine WGs have the same kind of contacts....well, if they have any sense.