Goodness, this thread has moved quickly since I posted, and thanks for the comments.
Perhaps I can get some dispensation to stay in France for longer, but I don't actually want to go for longer. Quite apart from Covid, I have very recently lost my husband and want to be near my family. That's really not what it's about. It's the fact that I need to ask permission to do something that I would otherwise have been free to do.
I may still be a European, but I will not be a European citizen anymore, as I was before. And that upsets me greatly, viscerally, that I have been stripped of that citizenship, dispossessed of something precious to me. And I am someone who remembers the pre-EU days, blue passports etc, yet I feel so deeply about this. So imagine how our children must feel, who were born as citizens of the EU and it has just been snatched away, even though the majority of young people wanted to remain.
We have let the younger generation down in this, as in so many other ways, especially with regard to education. So many take out vast loans at exploitative interest rates, in order to obtain a degree - often with poor quality teaching - and limited job prospects. And who will be paying for Covid in the long run? Not the people on this site, but the young people who can't get jobs, afford houses, pay for eand now have to lose their European citizenship, on top of everything else.
But it is not just an emotional reaction. Truly, logically, I cannot think of one good reason to leave. Economically, we will be worse off - why would we want to trade with Japan and Australia at the expense of our nearest neighbours, even without regard to the carbon footprint.
And, as a former lawyer, I genuinely don't understand this fixation on the European Court - it is simply an extra layer of protection, a last right of appeal, but the amount of cases that actually go there is absolutely minuscule. And this from a PM who tried to prorogue parliament and was outraged when the Supreme Court held that this was unlawful - presumably the government could have appealed to the European Court. you couldn't make it up really, a complete and utter farce.