He can start instruction at 14, solo at 16 and hold a licence at 17. Both my sons can't wait 'til they're able to learn and both want to solo on their 16th birthday. Two years of dual will be a bit frustrating for them though.
Any club in East Anglia will be able to oblige. I used to fly a lot in that region and all of the clubs were good, but that was a while ago and I can't recommend one from recent involvement. But experience suggests your most local club may be the best - especially as he won't be able to drive yet!