Then I think about the cess pit, buying oil for heating, running out of milk, dealing with muck heaps and mowing massive lawns and decide it’s all too much hard work
The cess pit should just need emptying you just employ a company to do it, they schedule it in and doesn't cost much. You don't need to be involved.
Buying oil for heating is very simple, you can either spot buy or just set it up on a contract, they remotely monitor your tank and fill it up when it reaches a certain level and you can pay by dd monthly. Again you don't need to be involved.
Mowing the lawn, you either buy a sit on lawn mower, and it then becomes much easier than actually pushing one about. I have a three acre garden mainly laid to lawn and it takes me about an hour and a half max on the ride on.
I don't know anything about muck heaps though, or why you'd have them. But as a lottery winner, you may be able to afford a gardener to cut the grass and someone to pick up thr muck