Tony Benn is certainly posh in that sense, yes. He renounced his title and committed his life to working class politics, but he was born into aristocracy and would have had all the privilege had he stayed. I'm a fan anyhow.
I'm not really comfortable with the term because, as I said, it's...
New money etc. He's certainly got a working class accent - in the traditional, almost outdated sense. The term 'posh' is almost impossible to pin down now, perhaps due to the far more fluid class system of post WWII Britain. It's a derogatory term that seems to be based on little more than...