The arrangements are now called The Air Cadet Pilot Scheme and the Air Cadet Pilot Navigation Scheme: ACPS and ACPNS.
The former, for example, includes a 12 hour course at Tayside Aviation at Dundee and there are other ways in which the course is delivered to selected cadets. ACPNS is IMHO a better bet since it allows much more than applied flying and whilst the hands on flying is less, the general aviation experience is greater.
Your lad needs to start jumping about at his ATC sqn to find out how the schemes are being organised in his sqn/Wg.
You say he does a lot of gliding - if that's with the ATC, then he's the only one who is!!!!!!!!!!! See other Threads re ATC gliding.
As reported above, there are other opportunities too numerous to mention here but in relatively modest numbers only.
Old Duffer