Oooh this has been my pet hate for years.
The only legitamate reason I've heard against unrestricted sunday hours is that some companies may force employees to work a number of hours at weekends - sundays in particular as part of their contract. I would've thought anybody who felt it impacted their beliefs would have the law on their side though.
We should be able to have a 24/7 society, as Smurfy sez it's 2007 how much longer do we have to wait! Most stores won't do it, but some will (Tesco's loaded so it'll be between them and Asda if given the go ahead).
There's nothing more frustrating than realising you need groceries at 5pm on a Sunday.
The National Consumer Council was supposed to be submitting it as a request to the government (along with a bunch of other things) - didn't hear anything about it though http://nccdev.keymedia.info/cgi-bin/kmdb10.cgi/-load425007_v iewcurrent.htm
We're lucky though, some countries in Europe shut down completely on Sunday!