The “Working Classes“ won’t wake up because they all think they’re middle class!
Some truth in this - I meet people who are on modest incomes, rely totally on NHS and other public services, own a modest property, but because they receive no welfare benefits except possibly state pension they think they are no longer working class.
Middle class to me is likely higher education (unless over 75), own a property at least average value for the area, live in area which is over 50% professionals, use private medical services at no stage, have gone to fee paying school at some stage or someone in the family has, had a professional style job or middle manager. Usually speak without a prominent regional accent (unless Scottish or Irish) On Dad's Army its Mainwaring, Wilson, possibly Godfrey and the vicar. Fraser and Jones today would consider them selves middle class, but probably working class in 1940s. I consider them more working class.
The increase in white collar jobs and home ownership (over last 42 years) and higher education participation (last 30 years) has blurred boundaries. These new property owning, white collar but really still working class people are key politically.