OMG! A blast from the past that brings to mind an exact same scenario that I, myself, went through. I loved John Denver. I loved "Country Roads" so much I wore the vinyl out. At the time I was living in the suburbs of Detroit. Years later, I did relocate to the *only* area of West Virginia that Denver sang about in that song and it was a major adjustment in lifestyle from being a city girl and then a "mountain mama". I still blame Denver and then thank him.
I think that if Diana and Charles had more of an intimate connection mentally and enjoyed the same set of friends and interests, Diana would have been content with Charles anywhere they lived. Its not the physical location so much as the people around one that make life enjoyable and, lets face it, after marriage, Charles and Diana did not enjoy being with each other very much as time passed. I do have to think that for the most part, Diana was expected to move and fit into Charles' world far, far more than he ever attempted to move into and fit into Diana's.
It seemed to me that for Charles, after marriage, his life didn't change at all. Same duties and responsibilities and work, same friends, same downtime pursuits as he'd always done. Only difference was that there was a wife at home that felt excluded. This is one area where I can totally identify with Diana and her unhappiness. Like me, I bet if Diana had lived and found the love of her life that she totally meshed with, she'd be happy with him whether it be in a high rise condo in London or a sheep farm in the Australian outback.