Thanks.No, this card is "automatic" if you are a UK citizen resident in France before Dec31 2020 (with differences if you've been in France more than 5 years). It's part of the withdrawal agreement guaranteeing citizens' rights. You just need to provide a miniumum of proof that you are in that category. The application process is very straightforward.
Edit: perhaps if the proof of address or residence is a bit flaky, they might check it more thoroughly. But the evidence they ask for seems pretty flexible, and would be available to most residents as long as they have been here for a while and not living below the radar. Would be more challenging for the recent arrivals.
Do I need to produce any income details?
That was pretty 'thin' in 2019 and non-existent in covid 2020.
I think the address details will be ok. Junior is in the local school & I have 2 years impots but not much to show on them.