'Allo 'Allo! (1982)
9 series
*Scripted mainly comedy shows, no talk shows, game shows or shows where the comedy part was secondary/incidental, and only entirely UK productions. Limited to the 31 most popular shows based on IMDb ratings (2,000 votes or more) plus the 4 longest running shows with fewer votes.
Check out this poll for shows that lasted less than 4 series.