Its freedom to choose and freedom to be allowed to offer a service that the public want.
As a regular chuch goer I see no reason at all not to let shops open on a Sunday. We now live in a 24/7 world where we expect all services and facilities to be available at all times. Alow shops to open on a Sunday if they wish – it would not be compulsory. Why can't I pop to my local supermarket before the early service on Sunday or even on my way home from the evening service?