Regarding #2 son being able to find engineering work, then Wales may not be the best location anyway. Nor as far North as I am, sadly. Lincolnshire seems to be a good place to buy a smallholding - good land and not too expensive, I'm not sure about work prospects. Otherwise south-west Yorkshire maybe? Or Lancs?
If you can afford Shropshire, Dorset, Somerset or Devon, and can find somewhere that fits and is commutable to the right sort of work for him, then whyever not. There are lots of smallholder types in those locations, they're holiday destinations for your putative campsite, they have summer and everything, you can grow your own veg (Yorkshire's good for that, I hear; upland Cumbria and western Northumberland much less so.)
The only real downsides of South West England, for someone with aspirations such as yours, apart from property prices, are:
- can get summers that are too dry, hot and long, drying up the grass and making growing vegetables difficult
- TB is endemic, so something to consider if you are planning camelids, deer or cattle, particularly
- you get a lot of tourists - which can be an upside if you have a tourist-related business, but can be a downside in terms of the roads being clogged with tourist traffic in summer
(I moved here from Exmoor, so I have a little knowledge upon which to base my analysis.
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(I'd list other pros and cons for someone with different aspirations, so if anyone else is piggybacking this thread, please start your own thread so we can give you input for your particular situation!)