I was dithering on whether to include some U / non U dividing words in my list, or whether to limit it to regional dialect. By the way, for those three, I'd say "napkin", "living room" and "couch". Dinner's the main meal you have in the evening, but ideally at more like 6.30, not 8 - although I was brought up to have dinner on the dot on 5. A very posh-sounding and affected person once told me that my accent and vocabulary was more or less acceptable, except that I ruined it all with my "frightful" northern vowel sounds in words like "class". "You should change that," he told me. I didn't.