In reply to Removed UserDoug Robinson:
Definitely speak to your county advisor as suggested by Gavin - you should be able to look them up in Compass.
Make sure you think about what you're trying to get from the climbing sessions. Swapping to auto-belays will remove the teamwork aspect from the sessions, removing one of they main learning opportunities. Yes, the young people will still get to climb the wall, but you'll have many more of them not engaged in the activity compared with using one of the many peer belaying options.
I guess you might be considering auto-belays to reduce the training requirements on supervisors, but for a private wall it may not make that big a difference, because you still need to be able to deal with any problems that occur. I'd suggest you might be better off putting the money towards getting a group of you trained up - your county advisor or a local MCI might be able to help you with something bespoke for your wall to get a group of you with the appropriate permits, and will help develop young people more in the long term. NGB training plus assessment will probably cost you under £250 a person and will set you up for a much broader set of activities, including using walls when you're away elsewhere in the country.