>>1508292What's stopping you from getting it designated then? I don't know british laws in detail, but in pretty much any western country that has such restrictions it is possible to circumvent them in some way.
Here in germany, for example, if you own 26 beehives, you're legally a farmer and if you're a farmer, you can legally build a house on your own land anywhere except for nature reservations, water protection areas and close to military important locations.
IIRC the UK had something similiar for homesteaders.