Herne Hill Velodrome run training sessions (not on the main velodrome) for kids of all ages.
Our 6 y/o benefited greatly from their tuition.
From the website
http://www.hernehillvelodrome.com/sessi ... ning/kids/
Frog-Bikes Cycling Sessions (4 - 8 year olds)
Herne Hill has teamed up with lightweight kids' bike brand, Frog Bikes, to give children aged between 4 and 8 the chance to participate in some special sessions on the 250m junior track on Thursday evenings 5-6 pm. The hour-long sessions, which will cost £3, will introduce youngsters to the basics of bike riding and will give them the opportunity to both develop and practice their general bike handling and cycling skills. Frog Bikes have kindly donated a fleet of their bikes for the young riders to use during the session, or alternatively they will be more than welcome to bring their own bike along to learn on.