@Andy in Germany thank you. That's how I understood things to be previously. Could you help me a bit more as I've struggled with this. Ridiculous I know.
We visit France a lot. Usually flying Manchester Nice or when the kids were small by ferry. We've always done a passport check. I don't think we have ever walked straight off the plane and in either entering France or the UK.
As far as I know I don't suddenly need a visa to enter France so why has it all gone so badly wrong all of a sudden?