In reply to Nick Harvey:
As of yet, my son's is in a 90day notice savings account which gives 2 benefits;
1) Access if absolutely needed
2) Slightly better interest rates (tax free 2.5%)
As he only turns 3 in January, I figure I've got another 13years to work out where to stash it so that he doesn't p1ss it all away when he gets control of it at 16.
As things stand now, I will probably see how much he has on his 15th Birthday, keep a little in his account for his 16th Birthday and invest the rest in a bond that matures on his 25th Birthday.
Failing that, take the money back before he turns 16 and then give it back in instalments.
I had a bond mature when I was 16 and again at 18. By 19 it was gone. I'm not happy to let that happen again!