The TARDIS arrives in London in 1966 and the First Doctor and Dodo visit the Post Office Tower. There they meet Professor Brett, whose revolutionary new computer WOTAN (Will Operating Thought ANalogue) can actually think for itself and is shortly to be linked up to other major computers around the world — a project overseen by civil servant Sir Charles Summer.

Jean and Bill are a married couple trying to scrape a living. Out of the blue they receive a telegram informing them Bill's long-lost uncle has died and left them his business—a cinema in the town of Sloughborough. Unfortunately they can't sell it for the fortune they hoped as they discover it is falling down and almost worthless.

Classic British drama about the residents of a large terrace house in London between Christmas 1938 and September 1939. Percy Boon lives with his mother in a shared rented house with an assortment of characters in central London. Although well intentioned, he becomes mixed up with gangsters and murder. The story focuses on the effects this has on Percy and the other residents.

Lucy and her brother are struggling to make a go of their Soho pet shop, until Lucy meets Tom, a street singer.