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.
Wansdyke, bivvied there, find the relevant house.
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.
Like I have said before, I'm a land owner. From some of the statements I have read over the few years I have been on this forum. To be honest. I have as much faith and confidence in good practice, coming from mature teenagers. I would have thought that any member on this forum, could be trusted with any permissions granted from me, to camp on my land. A good number of members may need extra support, tuition, guidance before I would have confidence in them. But I would never expect or tolerate rudeness or ignorance. A small price to pay for sharing in the enjoyment of the great outdoors don't you think?