I'm common because:
I wear brown socks with black trousers.
I have my tea in the evening not diner.
I can name four East Enders characters.
I swear in public.
I don't have a second name as my first name (eg Findlay, Crawford).
We have a living room not a lounge
But I may be posh because:.
I went to a Grammar School
I don't wear black socks with open toed sandals.
I don't have a 46" television.
I have never owned a shell suit or shopped in my pj's