I’ve just finished watching HIdden and it has struck me how alien Welsh sounds (I grew up in the south east). For most western European languages, I will recognise a few words if I hear it spoken but pretty much none of the speech in Hidden sounded familiar.
A Spanish friend speaks Castilian Spanish but also speaks and understands a couple of other Spanish languages / dialects. It seems weird to me that there is a living language within the UK that I know virtually nothing about.
I know it isn’t as widely spoken as a few European languages learnt in school. However, I did French and German and can say that I can remember virtually no German whatsoever (I wasn’t very good at it). I have tried to speak it in Austria but the bar staff laughed and spoke back to me in English.