I got a possible insight last week into the difference it might make when we become 3rd country migrants, rather than ressortissants britanniques.
I had a planned 2 day hospital stay, so all documents sent in advance and clearly told to turn up with nothing but carte vitale and toothbrush. Which I did. But on arrival they asked for another identity document and the only thing I had with me was my carte de séjour. Big mistake. I was immediately grilled on my migrant status, and had to explain several times that if they looked they could see it was a european CdS. It’s possible the people I was encountering had never seen one before.
Anyway all sorted, and the 2 days passed without further event. However on Wednesday this week got a phone call from the hospital demanding more details of my migrant status as the hospital stay has to be have cleared with the intentional convention. A very long circular conversation as woman I was talking was convinced I was a 3rd country migrant as I had a CdS!
I wait to see what will happen to hospital bill, but fully expect that this is not the last chapter in this tale.
It will be interesting to see what changes in attitude there are post B@#£&t. And may make decision about applying for nationality (although have applied for German nationality and not sure one can have 3).