In reply to jonnie3430:
> Moped of a good idea, though what bike? I think 50cc is the max, so scooter, scrambler or tiny sports bikes are the interesting ones as they are only owned a year, as you can then go bigger (they'll do 30mph.) Scooter is probably most sensible, tiny sports bike least sensible and I'd probably recommend that type you can get cheapest insurance on.
To ride anything on the road at 16 you'll need a CBT - that's most of a day and costs around £120-ish. They will supply bike, helmet and some other bits - check current prices and what you need to bring with your local school. The danger is he'll want one
50cc bikes do tend to be owned for a year until the owner moves on to a 125cc at 17 - this generally means most of them have been absolutely thrashed to bits by 16 year olds hoodies ragging them around. A bunch of them that lived down the road from my last house rode them like maniacs and were regularly seen trying to pop wheelies on them.