Yes.
I've always found the Sunday trading laws odd; my understanding is they were driven by the church, and I've never understood why the church should hold any sway on the Government that would stop me from going to Sainsbury's at 4.05pm to buy a loaf of bread or to Homebase to buy some screws.
What they hell has it got to do with the church?
If companies want to trade on a Sunday at hours they decide, then it should be entirely up to them; if it turns out it's unprofitable to do so, they would soon stop.