It is one of the few British TV shows that I know.
In my teenage years I had a brief exposure to TV. This was in Canada. Enough said.
OTOH I've yet to meet a 'Merkin who knows of it.
Cheers,
Ben
PS The original version of that lacks the not. I prefer that version because it makes it obvious why the speaker would choose such a convoluted way of saying it. :-)