Technically, we were supposed to do French. However, I was in a "naughty" class who seemed to make it a mission to get the teacher to leave the classroom in tears. I bet that she was glad to see that back of most of the class! Unfortunately, I didn't learn very much French, so didn't care to do it for GCSE.
If I'd known that I would eventually grow up and move to Wales, I'd have preferred to do Welsh, which I continue to persevere with as an adult! It is very tricky, mainly because of the grammar and mutations. A work colleague joked that the language was made that way to keep the pesky English invaders from knowing what the Welsh were on about 😁