Thank you both.
There are stables, but I have a feeling the previous owners (sadly passed away so I can't ask them questions about previous use) were more of the "use it and wait to see if anyone notices" people. So it might have had some of the smaller fields used for paddocks.
How would I find out definitively what bit of land is classified as what use?
Would you know of any links to government websites etc of the rules on the land use? I've had a search, but only keep coming up with a recent study by the gov into how much of the UK's land is agri, not details on allowed usage.
And I suppose a direct example of things I'm thinking about, with growing crops on the land, do you know if I'm allowed to grow crops in raised beds rather than directly into the ground? (for what its worth, this isn't me thinking about renting out the land as allotments, it would only be us using the raised beds)
Ta