Thought I'd mention (OK, I was asked) that Redhill do a bike training thing for kids. It's on a Sunday so doesn't clash with the club run and it's run on a school playground (or field depending on weather). They teach stuff like group riding, looking behind, one handed riding and general handling skills. Website is here [url]http://www.redhillraiders.org/content/about-us[/url] .
My son has been to quite a few and improved his skills and speed.