Very easy, all you need is money or a mortgage, there are plenty for sale especially the smaller ones on higher ground ( trad hill sheep farmers) Location decides price the nearer the rich south east the more expensive it gets. Move to parts of Wales, the North or Scotland and land is fairly affordable.
If you have land be it forest or farm its fairly easy to get a gun licence for a Shotgun or 22 for vermin control, if you have deer you can expect no reasonable issues in getting hunting calibres.
Our laws though stupidly applied are primarily aimed at stopping youngsters in cities from carrying big bloody knives, once you get out to the rural areas common sense usually applies
EG the three lads along the road from me who love river fishing inevitably have 6 inch blades on their belts when they set of for the Fishing lake. As for gun ownership there is a clay pigeon club bout half a mile from me and they shoot 6 days a week from 9 til 8 and there is a waiting list for membership.
As for constraints on ammo in the UK, shall we say reloading is very popular and leave it at that
As for knife carry , common sense rules again, if I have to go into the city I wear a Byrd Tern UK legal 3 inch none locking folder, but even so I would not go into a school or pub with it on show. Back home in the boonies I wear a 3 1/2 inch blade Tec Hunter Light lock knife or my Cold Steel Voyager Tanto and I have worn a blade EDC along with multi tool and flashlight for decades.
Recently on a dark and very rainy evening we came across a police car at the side of the road, the officers were trying to free a foal that was totally tangled up with nylon twine stuck in a hedge. We stopped and the cops asked if anyone had a knife or something to cut the twine and fencing away. All three of us produced pocket knives and multi tools and helped free the critter. The local cops simply did not care nor had any interest in us carrying blades.
If we had produced those same tools in central London or Times Sq NYC we would have been arrested. If we had pulled them in Tottenham or Detroit we may have got tazored ( or shot)