We live in Wiltshire and you described a lot of what we have here...just as Somerset and Gloucester provide, but with both, since the county is between the two.
Wiltshire has some of the Cotswolds in it. Plus it has an incredible greeness, being very much farming. However, since where we live is not the tourist area, but having it all around us, we have the benefits of being close to it without the higher cost. (However, I think people are finding this out and our little simple town has jumped to number 34 in the list of rapidly rising house prices in the nation. Still very affordable, but growing by leaps and bounds.)
We're not job-related commutable to London five-days-a-week, because at peek times the cost may be prohibitive on a daily basis, but the fast train takes only takes 1.5 hours and rates can be had at off peek for a day in the city if you want to catch a show. Much closer are Bath, Bristol, Salisbury.
I don't know that I would suggest our town to live in, because I think it's rather bizarre that I love it so much. Maybe because on the outside it looks rather blue-collarish. And it does have a surprising amount of light industry and, yes, technical-related as well. What I love about it is something you can't see unless you scratch the surface. I have never been made to feel so welcome in a new place. They've accepted me as one of their own. Walking down the street, there's usually someone to say hello to or wave at across the road.
There is one down side here in this little town. The pubs have a reputation. There are some really nice ones, but there are also some to stay clear of, especially on a Thursday night. You can tell this spot is pretty social, though. For a place of 18,000 residents it supports 17 restaurants/takeaways.