Goodness! I am fascinated by this thread - so different from any of my own experience - you say you could even consider moving!
I am with those who say 'do nothing for awhile'. A shortish gap on a cv is not a problem for someone who has worked as long as you have. I would however consider the pension implications - you could 'sign on' but may not want the hassle. Look at paying voluntary NI contributions for awhile.
If you could consider moving, you might want to go somewhere you fancy, stay in an airbnb or with a friend / relative and look about.
You could sign on with an agency, often a good way to see what is in demand and try new things.
It does seem that gardening / small handy jobs are very much in demand. If you can afford to bring in a smallish, irregular income, you could look at that. But be aware that any self-employment, especially something that relies on physical skills may not be reliable long-term. However, sounds like you could give it a go!
About 50 years ago I met a lovely lady, of the generation that anything out-of-the-ordinary was called 'bohemian'. She had made her living at lots of things, and finally, at your age, decide to live as frugally as she could. She sunk all her money into a small house with a decent bit of land, and spent her days growing fruit & veg, tending to pigs and chickens, and bartering.
Will you keep us informed?