Thanks for the link NS, which clarifies things. There is a world of difference between head covering and full face covering.
However, I particularly noticed this from the link you posted:
France
A ban on Muslim headscarves and other "conspicuous" religious symbols at state schools was introduced in 2004, and received overwhelming political and public support in a country where the separation of state and religion is enshrined in law.
I understand and appreciate the separation of state and religion but still, France is comprised of people with diverse religious beliefs and cultures. The ban seems wrong to me, nevertheless it is up to the French and as nobody is harmed, not my business. I'm glad we don't have such a ban here though. It is good, imo, for schoolchildren to mix freely with those from many different cultural and religious backgrounds; if they do that they will not attach undue importance to anyone who wears something that they don't wear, in fact they will hardly notice it.