I think we started to question who was middle class when the working class had no work to do. Up to then you saw the working class travelling to work or working. When I was going to school by bus and tram in 50s Sheffield, you never saw a man during working hours.
There was the divide between blue collar and white collar workers. Life was simpler then, and the class divisions because they were obvious were less talked about but accepted.
We never had dinner in the evening, always tea and since living abroad I don't know what I'd call it now. I use the German words at home anyway, but if visitors come from the South of England I say supper.