I’m not sure if this even counts but I’m from Cornwall, which at one point was a separate and distinct culture from England, but hasn’t been for hundreds of years. But once it had it’s own language, and has been recognised as being culturally distinct by the UK government and the EU.
It doesn’t really impact me in any big way, especially since I don’t even live in the UK anymore. I know a handful of words and phrases in Cornish and there’s been a bit of a movement in the last few years to revive it somewhat (it’s on some road signs and things like that), but generally the rest of the UK doesn’t care, and if you talk about it to anyone outside of Cornwall they’ll usually just make fun of you.
There’s a Doctor Who episode with that idea in it too, the Doctor saves a girl in Viking times but brings her back forever, and when he meets her in mediaeval times she has a whole library of books that are just her memories that she’s written down over the years.