When I moved to France over 5 years ago I used my British passport for all the formalities (social security, tax, etc). I also have an Irish passport (NI birth).
Post Brexit (or earlier), what do I need to do to register under my Irish citizenship and avoid all the CDS fuss? I’d appreciate advice on which authorities I need to inform. I’ve read lots of articles saying it’s not an issue, but I cannot find any concrete advice on what to do.