Ryanair UK??
It's interesting that you state that "I work for Ryanair Uk Ltd (as do ALL Ryanair staff within the UK) And we pay tax NI ect, ect just like you!".
When I took Ryanair to court, their first line of defence was that I could not sue them in the UK because they had no employees in the UK, and that all their staff are offshore because they work airside.
It struck me as nonsense but they had some kind of court judgment that appeared to support the claim.
However they settled out of court so these claims were never tested.
I am not surprised that France is trying to stop the practice. Although there are lots of silly protectionist practices in France I am not sure that the idea that people who live in a country should pay taxes in that country is that unreasonable ...
I would be interested in further clarification from FR staff.