Every once in a while I come across something that I did or had in my very working class childhood on a rough council estate that is apparently middle class but is just bog standard or was to me. Easy examples
Skiing, you learn on a council run dry slope in primary school.
Porridge, you have it with salt and it’s a quid or so for a bag that lasts ages.
Oatcakes, they are cheap default snack better than crisps easier than a sandwich with a mini cheese.
It did make me wonder if there are there things that people in other parts of the UK grew up with that are really average (to them) which I’d of thought of quite posh as a child.