BBC sitcom's future in doubt as writer hints that 13 is 'a nice round number to end on'

One of Britain's longest running sitcoms could be coming to an end after the upcoming 13th series.

Not Going Out still pulls in millions of viewers but creator Lee Mack has cast doubt over the show's long-term future.

A 13th series of the comedy, in which Mack plays a fictionalised version of himself, is currently being worked on.