TV Guide BBC Four Tuesday

Insight into the rebuilding of New York following the events of September 11, examining the future of Ground Zero. Also featured are the city's modernist gems which display both innovation and high levels of quality _ unlike many post-war buildings, which were often constructed using techniques designed to reduce costs rather than enhance their aesthetic appeal

Kenneth Williams stands in for Terry Wogan, chatting with guests Barbara Windsor and husband Steve Hollings, Stephen Fry and Michael Palin. Music by Hank Marvin & The Shadows. First broadcast April 23, 1986

An intimate portrait of the comic actor, a highly talented and deeply insecure man who remained a cantankerous contradiction until his death in April 1988. Friends and colleagues describe a man whose outrageously camp performances delighted audiences and disguised an essentially brooding personality. Includes contributions from Sheila Hancock, Miriam Margolyes and Michael Parkinson, as well as clips from his finest moments on TV, radio and film and readings from his diaries

A 1983 documentary in which Kenneth Williams explores his roots, including the slum architecture in and around London's St Pancras district where he grew up, his grandma's fruity anecdotes and the musical knees-up of the local pub

A look at the international network of undercover officers attempting to penetrate the hidden corners of the internet to stop those who exploit and harm children. Operating across borders, cultures and political divides, this rare collaboration sees law enforcement agencies from countries including Russia and the US working side by side

When Russia invaded Ukraine, a schoolteacher in a small industrial town picked up his camera and began filming covertly, becoming an unlikely dissident. His footage captures a portrait of how propaganda has seeped into everyday life in Russia, with patriotic lessons and military drills replacing regular classes, drawing children into the machinery of war