The discussions about class are really interesting. I come from a background where my parents were very poor, and I got a scholarship to private school and then to Oxbridge, and then had a professional career.
The traditional way of determining class was by your father's occupation.
But it is more complicated than that. Your background and childhood is very important in how your personality develops. Alongside social class are factors like ethnicity and religion. And then education changes your mindset in all sorts of ways, and certainly affects how you speak and what your preferences are in terms of how you live your life and choose to spend your leisure time, your aspirations etc.
If you start out as working class and then "get yourself an education" as my grandmother put it, then you might end up living most of your life in a very middle class milieu. What class are you then? It's very confusing, not least for the people living it.
if you have spent most of your life as a doctor or a lawyer or a professor, you might feel working class still, you might actually be "educated working class", but other working class people might feel that you have a very different life and outlook to them, and I guess they would also be right.
Edited