Personally I think @LauraPidcockMP is right - a lot of "middle class" people, like me, are really working class. But I'd be reluctant to say it, because people don't like it if they think you're pretending to be something you're not https://www.chroniclelive.co.uk/news/news-opinion/laura-pidcock-youre-probably-working-16829656 …
Do these distinctions have any meaning now apart from aggravating social tensions? They are 19th century. Look at income and education if necessary but don't divide people with meaningless labels.