I was thinking that next year more riders could enter from the Rocko ??
Have You got a hub geared bike? Any type will do - Shopper, Brompton , Hetchins even a Chopper! As long as the gears are in the HUB (Sturmley Archer etc.)
You have about a year to source one out; check out http://www.bikejumbles.co.uk/tincanten/index.html
Let me know if your interested, next years event is July 7th 2018. Just turn up on the day - entry £3, free teas /cakes (donations).
It's a nice afternoon out
Regards John Dainty