Where would I look for a field to rent?

I don't want it for livery or anything like that, but to use for dog training so all I'd want is to be able to take dogs on there and erect a small storage space for equipment.

Any ideas where to look as I have no idea!

Thanks!

If its just on a casual basis, I would suggest contcting the farmer directly. Alternatively, have you considered an allotment? I know Todwick parish Council have some available.