COMPREHENSIVE PRANKERY starring a mob of tousled twenty- (in some cases thirty-) somethings squeezing behind desks pretending to be rowdy teens and giving the run around to dapper but dithering JOHN ALDERTON. Fenn Street Secondary Modern was the location, seemingly built just behind the world’s largest power station. Antique establishment populated by dusty relics JOAN SANDERSON, DERYCK “WHERE’S ME WASHBOARD?” GUYLER and NOEL HOWLETT, all of whom regularly professed to being completely bemused by “young people today”. Close to 568,399,035 episodes made. Stop-start bell-ringy theme in the top ten sitcom openers of all time.