I seem to recall that, when the regulations were relaxed, in 1994, it was on the basis that we should have a "continental Sunday"! However, having spent a considerable, and increasing, amount of time in France over the past twenty years, and some time in a number of other countries in continental Europe, I see no indication of "Sunday Trading" being the norm! Indeed, apart from some of the larger supermarkets, one would have great difficulty in finding any shop open on a Sunday in 'my' part of France - and even they usually only open in the morning.
It is interesting, is it not, that medical and physiological experts have 'discovered' that human beings need one day in seven in which to relax, in order to avoid physical and/or mental breakdown. They probably spent hundreds of thousands of pounds, sterling, on the research that led them to that conclusion. They only needed to read the written Word of the Creator: "Remember the Sabbath day, to keep it holy. Six days you shall labour, and do all your work; but the seventh day is a Sabbath to YHWH your God; in it you shall not do any work, you, or your son, or your daughter, your manservant, or your maidservant, or your cattle, or the sojourner who is within your gates; for in six days YHWH made heaven and earth, the sea, and all that is in them, and rested the seventh day; therefore YHWH blessed the Sabbath day and hallowed it." (Ex 20:8-11).