When is a sitcom spin-off more successful than the original? When it is one of the most iconic - and enduringly popular - comedies of its age, George & Mildred.
Between two BBC sitcom hits, Wendy Craig starred in a popular 1970s ITV comedy ...And Mother Makes Three, and its sequel, Five, as the frequently flustered widow and mother, Sally Harrison.
As his new book on 1970s sitcoms is published, author Robert Sellers takes a look at the topic of British sitcoms being re-made for an American audience, in the process sharing some of the conversations he had with the original writers involved.