This final episode examines the legacy that the classic comedies left behind, and looks to the future and at how modern day sitcoms have both their inspiration and comedy roots firmly planted in the past. With clips from Benidorm, Dinner Ladies, Early Doors, Blackadder and The Young Ones, archive material, and interviews with Richard Briers, Don Warrington, the late Wendy Richard, Jean Boht and Sally Thomsett.

• Eleanor Bron