it's great to see that kids are being re-introduced to competitive but fun cycling. Well done Colin for what sounds to have been a cracking event.
We seem to get a few kids taking part here in Australia and the taking part seems to be driven by the schools as well so you may be on the right track trying to get news of the event out through them. There is also a 'Parents News' free newspaper in Kent once a term from the primary schools that you may be able to get something in?