I know that area slightly because I have a very good friend who retired there, and we visit a few times a year. It is horrendously expensive! I also have good friends in Shropshire, and think you will notice the difference.
I strongly echo M0nica's advice about renting. My experience is that only by living somewhere can you pick up the smaller bits of information about where suits you.
Have you visited much? If not, I would go and stay a week or so, and have a good look around, and try to find somewhere to rent.
Of course we don't know what your financial situation is, whether your current home is rentable, or your time scale.
I would say it seems a lovely area, we have been on some lovely walks. My friend is well off, and getting into London is important to her, so she lives near a station. I gather that further away from the stations, it is rather more affordable.
I always suggest driving by the house you are planning to buy at odd times - 11/midnight on a Friday / Saturday, Sunday afternoon, rush hours etc.