That is a very good question and i fully understand where you're coming from vickyjakesmum
Unfortunately, life has changed on a Sunday thanks to the way society is now. It's easier for some families to go shopping on a Sunday if they work all week or some people like to work on a Sunday, as they can get child care easier.
Retailers will always try to grasp the last penny in the dog eat dog retail world, so I can't see them changing course on Sunday opening.
Things will never be the way they were and should be glad it's only a permitted 6 hours opening on Sunday really.
I do sit on the fence on this one, as I can see both sides equally.