Actually, regarding jm's comments... My boys have Islabikes but virtually never use them (last time was a hill climb in October). They spend nearly all their time on their DH or dirt jump bikes on the moors/pump track. Great community, plenty of races from age 11 up, and perhaps marginally safer (though we've had one nasty injury...) I hope they're developing good bike handling skills while they're at it. Roads are nasty places for anyone. Having said that, I used to ride all over the show on my road bike when I was 9...
Nick