After a week of trying to build my boy up. Increasing his food intake (lots of bacon and eggs etc as well as sponge/suet puddings). I even trawled the supermarkets and local chemist for protein shakes. I don't know if he has gained any weight yet. He has been doing lots of muscle building excercises but no running.
Yesterday he got a phone call from the AFCO (Armed Forces Careers Office) telling him that the Doctor who he had seen hadn't realised he is under 18. The minimum weight is less for under 18s so he has passed his medical after all.
He is now waiting for a letter giving him the details of his 3 day pre joining training course which all prospective Gunners have to go through.
He is a smiley boy again unlike JA and OJ who are sad that this means I won't be forking out to buy extra food!