I don't mean this too horribly but when I hear that Jonny is a brilliant musician and has grade 7 aged 14 and might go to music school I die a bit inside.
So Im shaped by personal experience here. I did all the grades on the cello by 12 and was a decent cellist and a music scholar. But what parents need to understand is a couple of things. Unless you have grade eight at about 8 (or very soon after starting if later) then you aren't going to be a concert soloist. Even if you do you probably aren't going to be a concert soloist. I wouldn't even have probably made it to be a decent cellist in an orchestra earning 30k for a tricky life touring and barely able to afford anything. So everyone should remenber music is just for fun. None of the kids are going to make it. Just find out how talented you need to be "just" to be a music teacher at a school.
I cant say this out loud at the school gate so I'm saying it here!
Oh and if they love sport get them private 1 to 1 coaching even if they arent the next messi. Just as worthwhile. Forcing talentless musicians to scrape their way humourlessly to grade 2 is awful for everyone involved