The RSPCA has been working very hard to try and stop this- but it is a truly underground world, and very difficult to get access. All is organised by word of mouth within- Same for badger baiting with dogs, cock fighting, etc- all are closely related and involve the same people.
I used to work closely with our Police Wildlife Officers in Leics and Rutland- but the service has bee totally cut and does not exist anymore.
I do have mixed feelings about viewing the film- but although I am not sure I'll watch (as said, I've got plenty of knowledge on the subject already)-perhaps it is best people are made aware of what is going on on their doorstep- however disturbing it is. People who get this information risk their lives doing so- these people are very violent and lots of money and perhaps even more importantly 'kudos' are at stake. Surely it is best that we know- same about other kinds or cruelty.