I’m ex REME I have left about 2 months ago,
I join when in was 18 and have spend 6years living the dream. All I would say is push for him to get a trade. You still need good quals to join the REME (c’S) after his barb test he will be given a list of jobs he is eligible to do.
He can do the barb test and there is no requirement to join the mob, just to see what he can do.
I would really push against joining the inf. But that’s just my opinion. Nothing against the inf. Just looks like proper hard work for sh1t promotion and on off tours