If you want to try out balance bikes, I highly recommend the 2-5 year balance bike session at herne hill velodrome. Check out their website, its on tuesday mornings and friday evenings 4-5:30 (although friday afternoons end this month). It is ?3 for the session and ?1 to try out their balance bikes if you don't bring your own. Celeste, the coordinator and instructor is very good to talk to and your little one can see others her age cycling too.