where can my son ride his bike legally near selby , north yorkshire uk?

[mariestevematti]

i recently bought a quad bike for my son to ride on the field at the back of my house and already a busy body from down the road has complained its only a 50cc and i bet he wouldn't rather he was out causing mischief to his property , anyways i wont go into that. does anybody know of a place in or near selby , north yorkshire uk, where i can legally take him.
regards steve