Mr Khan was originally a character on 'Down the Line', a hilarious and very clever Radio 4 spoof radio phone in show. He was one of the best characters, along with Tony Beckton, east end gangster, and Early D, Brixton rude bwoy.
Listen to it if you can find it, especially if you have ever listened to real phone in shows. Great satire.
Citizen Khan doesn't really live up to the radio show but it's not all that bad, most of the complainers seem to be white Englishmen trying to be indignant on behalf of the poor Pakistanis. Not necessary.