Ask H&H: renting land

Q: I wish to rent approximately nine acres of land for grazing horses, and the landowner says I will need to enter into a farm tenancy. Will that be sufficient to cover me for my own use and for some liveries, as not everyone sees grazing horses as agriculture?

I’m also planning to develop a cross-country course on the land for occasional training sessions and hunter trials. Do I need planning permission for this?