Hi wardy, haven't got a clue,don't live in London anymore, but I would think in a proper working class area like Bermondsey or Shepherd Bush in west London,
Definitely Little Britain - don't usually laugh at Catherine Tate at all - the 'am I boverred?' thing is very annoying now! I did watch the last 10 minutes of tonights though, and have to admit to laughing at the couple who find everything hilarious, and also the Nan and Sheila Hancock at the end.