Thank you.
As I hope I have made clear, these French requirements have always applied to third-country nationals. What HAS changed is that for British travellers they were (almost) always dormant. But at Dover and St Pancras (and probably French air/sea ports) those questions will now be asked.

Thanks Mark. Do explain where I have done this.
For example, I say:
The EES kiosks in the Eurostar terminal at London St Pancras International and at the Port of Dover ask travellers “Do you have medical insurance?” This has been a requirement to enter France (but no other EU country) for many years

So sorry to hear it, can you kindly email all details to [email protected]?

Lovely, thank you. If I am not mistaken, Polish/Soviet black marketeers were often on board doing deals at every port.