I have quite a 'posh' accent as I've been told, especially considering I grew up in the provinces. I attended a Jewish state comprehensive school. Lived in a 4 bed semi where my parents were teachers. Pretty lower middle class, with parents who'd fallen in wealth from their upbringings so had pretty similar accents to mine.
People always assume that I had a naice upbringing with boarding schooling and lived in a huge detached, like my parents did growing up.
People always act so surprise when I tell them I come from humble roots.