It’s a question Badenoch might be able to answer as it is she, the daughter of a Doctor and a University Professor, who laughably claims she ‘became working class by working at McDonalds.
https://www.lbc.co.uk/news/kemi-badenoch-claims-became-working-class-after-working-in-mcdonalds/
If she doesn’t get back to you with an explanation you might want to try EP Thompson’s classic, ‘The Making of the English Working Class’.
It really is a very good read.
https://amp.theguardian.com/books/2016/jun/06/100-best-non-fiction-books-no-19-making-of-the-english-working-class-ep-thompson-1963-robert-mccrum