JaneJudge
or as we call it in our house, council pop
It’s ‘Adam’s ale’ in our house. 
I don’t think posh and snob are interchangeable terms. I think of a snob as someone who looks down on others. Someone posh might also be a snob but, in my view, acting snobbishly would make them not posh.
I did recall last night of someone I know who is considered by many to be posh. Big old house (also very cold and draughty!!), family antique furnishings, old cars, a golden Labrador. She wears traditional clothes, wool jumpers, woollen trousers and speaks with a cut glass accent, went to boarding school and has on the wall the childhood watercolour portrait her parents commissioned.
She’s also ordinary, friendly and kind, not at all snobbish. 