[prawn]

On the cave front, your best bet might be car dwelling on public land. I don't know the options in the UK, but there are opportunities in Australia and loads in the US. In the US you can go camp in the forest or desert away from the chaos and (generally) only have to move every 10-14 days. Depending on the vehicle you have, you can do this with minimal expense and as a full-time lifestyle decision or just when you need to clear your head for a weekend.

It's very liberating being out in a forest or desert, especially without phone signal. Fewer distractions, fewer possessions.

[tonyedgecombe]

We don't really have the space nor the climate for that in the UK. Some people do it but it's out of desperation rather than anything else. You will get hounded by the authorities as well.