Hi again Justin
Sure if they usually work within a shop they're deemed to be a shop worker, irrespective of who employs them:
www.xperthr.co.uk/.../
(It's wholly anachronistic now that Sundays have little or no observance, but it's still the law. I can recall as a child my grandfather who was the village children's playground voluntary secretary chaining up and padlocking all the swings and rides every Sunday lest any children might fail to observe the Sabbath by enjoying themselves on them and my mother saying he would never allow her or her sister to have icecreams or lollies on a Sunday for similar reasons - how times have changed!)
