It would benefit millions of people who currently find that their freedom to shop is restricted for no good reason, it would create jobs in the retail sector and it would help the reovery by increasing the hours during which commerce can take place.
The Government has no business telling people what they can and can't do on Sundays. If there are enough people who want to shop on Sundays to make it worthwhile opening the shops then shopkeepers should be free to open whenever they want. The current position is quite illogical. The principle of Sunday shopping is accepted, and small shops can open all hours; but ludicrous restrictions are put on large shops. If shopping is OK in a small shop then it's OK in a large one.