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I've got Czech ancestry and dug around a little to see if I could get nationality that way but it is complicated by my grandmother not returning after WWII and the communists revoking her citizenship for being a splitter. My grandfather joined the British army in WWII and got killed which means his citizenship was never revoked so that might be a path.
Before WWI my grandfather was a subject of the Austro-Hungarian Empire which I think means I'm eligible for Hungarian citizenship by descent too but I would need to learn some basic Hungarian.
Both routes probably require finding and paying an in country agency to guide me through the process and since I don't expect to ever live in the EU27 there doesn't seem a lot of point. I'd kind of like it for my kids though on the off chance they ever want to leave North London.
I was looking at this too, I've got a Swiss grandparent so thought I may be able to use that but they changed the law in 2017/2018 so I've missed the boat.