I remember our headmistress, Miss Hunt, lecturing us on the inappropriate ness of eating (e.g. ice-cream) in the street in school uniform! We were all rather surprised I think.
Where i come from Welsh accents were considered common. Somehow my GM scrimped and sent my mother to elocution lessons for years (she got to the highest level, i have her medals upstairs). Her cousin is still alive and you can hear her slightly elocutionised Welsh accent if you listen for it. Think Hopkins, Burton. Sian Thomas etc. Sounded much more anglicised than say, Huw the News.
Incidentally my DH keeps cracking up at the presenter on - i think it is channel 5 (the one with american crime on) - a VERY strong Port Talbot accent. I keep saying it is Rob Bryden hamming it up and he keeps disagreeing. But Rob, different generation, didn't get trained at an early age to talk posh like those other famous p'talbot boys.
I still find a certain valleys accent makes me thing people are a bit slow. I had a computer science lecturer once who had it. I remember him talking endlessly about the AD-Der (hardware, long obsolete) and lecture so boring we envisaged a reptile.