We don't have land taxes in the UK so no records for them for this purpose. Houses are taxed, Council Tax. According to Wiki 18% of land in England and Wales was unregistered in 2013. Our house and curtilage was unregistered until about 2006 in Wiltshire.
you could always leave a little note & your phone number on the barn door, explaining you had walked by and if possible, could you have permission to camp should you pass again. You carry a phone don't you? You only make things harder for yourself by being negative to obvious methods of achieving your goals longterm. Those who are successful, have tried many routes or got lucky. Those who fail to start or blow their chances & possibly other people's chance, by taking liberties & just "Doing" still go on complaining. Thing is, your not daft, you known there is a right way to go about it. It may not bring you the outcome you desire, it can be time consuming, even costly. But out of the millions of land owners in the UK, you really only need a dozen of them, to see you are prepared to make the effort, face to face or just a phone call. A pint in the pub or a bottle of brandy at Christmas. Just general curtesy. All you can wish for regarding longterm accesses to lands and you still openly promote bushcrafters conduct themselves like fools who can't use a map, a phone, ground research. I do struggle to understand the wisdom of it all.This is yesteryear of course don't do the distance now, but walk twenty miles. Then walk another X miles asking at different houses, get real.
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Wansdyke, bivvied there, find the relevant house.
Another journey about 15 years ago, walking from Streatley to Avebury overnight. 6pm Streatley and about 3pm the following day at Avebury along the Ridgeway. Some sleep on Wayland's Smithy Long Barrow. Pre-book with English Heritage? Or leave the customary sixpence for Wayland although I had no horse needing to be shod? Or just do what any weary traveller has done for millennia and rest for a bit at a convenient point. No tent, no fire, no trace. Quite pleasant then to meet a fellow walker who had done the same earlier and we walked on together chatting and enjoying the day.