In my bit of Norfolk, they seem to co-exist happily. People do their 'big shop' at the superstore, but there are still shops in some villages. For example, my local Co-op does a roaring trade, and is not a supermarket really.
I can see why people are upset at small shops closing in rural areas, as it is part of a trend, for example, pubs closing, post offices, and police stations. So some areas start to resemble scorched earth, in the sense that there are absolutely no facilities left, and you have to have a car to reach them. I don't know if Sunday opening will have any impact on this really.
I didnt know you lived in Norlfok as well, wiggles - one of my favourite parts of the realm. Lucky you.
Boring as it may be, my experience is the same as yours and that of Rhiannon. In my corner of Leicestershire I just so happen to be unusually well-placed for shopping. There's a large retail park about three miles away, the biggest stores of which are Asda, Sainsbury and M & S - all gigantic. There's a similarly huge Tesco about three miles in another direction and likewise for Morrison in another. In my village the two largest stores are Waitrose and Aldi, pretty well facing each other across the main road, about a mile away so technically walkable but not if you're walking there, doing a full weekly shop and walking back to the edge of the village where I live. But there are sundry smaller convenience stores - which
are within walking distance - for the little bits and pieces. All have existed for years, all do a roaring trade; in other words everybody shows every sign of co-existing happily and profitably. Which is exactly as it should be, as far as I'm concerned.