Yes, but you will need to meet the government's codes of practice on keeping horses. For example, your horse will need a suitable environment in which to live, graze and exercise freely. Typically, a horse needs around 1.25 to 2.5 acres as a grazing area. You will also need to consider accommodation or shelter, such as a stable, which is likely to need planning permission. In addition, if you wish to ride on the land, planning permission may also be required.