Pronunciations

School leaving age was still 15 as of 1 April 1947 - at least in the U.K.

MrJ left school at 15 in 1977, but that’s another matter.
I would never dream of correcting anyone’s prononciation or spelling unless they specifically asked me to, I think it’s very rude and condescending.

English is not my native language and I have never minded being corrected. After all, that's how we learn. I find it strange that it is considered rude.

I agree with Jax, it's condescending. My mother does this all the time, I wouldn't dream of 'correcting' her. Why would you?

I don't wish to offend any Irish grans but it's the Irish names I find impossible. I would have no idea how to pronounce Maeve, Niamh, Eabha, Saoirse, Roisin, Laoise and many more. The pronunciation just doesn't match the spelling at all. I'd have to learn by heart if the situation arose. I have Welsh family and they use Welsh names but I can manage those.

Greta I don’t think it’s rude to help a non native speaker with a word they may be getting wrong but to correct a fellow English speaker gives off the feeling that you are deeming them less educated than yourself and in my opinion would be rude
Irish names are very hard to get your head around chestnut Mave Neeve Eva Rosheen I don’t know the other one
Siobhan (shevorne) is the one I have trouble with spelling

they do match the spelling, but it's a different system of spelling.
you must have absorbed that with some welsh names too, so you just need to expand your repertoire of other-than-standard-english sounds/names.