Don, I think real tension could arise if a company changes its policy to working on Sunday and nobody wanted to do it! Would there be a stand-off? I don't know because luckily I've never been in that situation...

If you want to join a company where Sunday working is the norm, then it's probably a different kettle of fish - you either accept the specific working conditions in that company before you take a job there, or look elsewhere.

One of the reasons that some of my people preferred TOIL (Time Off In Lieu) to extra money was that, while you can tax money, you can't tax time!