Buying your own land....

[lachlanandmarcus]

Here is a couple of paragraphs from my local council website - The grazing of horses on agricultural land does not constitute a material change from a former agricultural use, however anything beyond the grazing of horses would require planning permission.
As a result although the grazing of horses on agricultural land does not require any planning permission any physical development associated with horsiculture such as stables, food stores, jumps and menageries etc and the change of use to the exercising/keeping of horses, which is not agriculture under the Section 336 of the Planning Act, would require a planning application.

This is correct, whatever councils try to say, pure grazing of horses (no stables no jumps no riding) does not require change of use as it is an agricultural use of the land even tho horses are otherwise not regarded as agricultural. In the same way, altho not agricultural farm animals, horses are specifically included in the laws on livestock worrying by dogs.

The issue raised by another poster about no additional feeding is an interestign one. You can feed supplementary feed, as again that is exactly what happens with agricultural animals. However the storage of such feed in any structure on the land would require PP. The only restrictions on any supplementary feeding at all would be eg in national parks, AONBs etc where there can be extra random planning conditions imposed related to 'unsightliness issues'