I don't suppose many people would be happy in my bit of the Alps - my village has one little supermarket, one bakers, a post office, two restaurants/bars and, of course, a beauty and hair salon. There is a shop selling skiing and other sports equipment. I live about 3 kms out of the village - my block of flats is right on the crest of a mountain pass or col. It is a three minute drive to the nearest shop, or a 20-minute walk down a very steep road. There are large supermarkets within a 30 minute drive.
There are, of course, all the usual large French stores in the nearest towns of Annemasse and Thonon les Bains, but as I rarely shop for anything other than food I don't use them.
I don't know Milton Keynes, but I suspect that if you like to go out in the evenings, to cinema, theatre, or bar you will be happier there than in the Alps! Horses for courses!