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Sir Lenny Henry takes us on a tour of Channel 4 in the 80s, from its launch in 1982 to cult music show The Tube, improv game show Whose Line Is It Anyway? and blasphemy in Brookside

Vic Reeves takes us on a tour of Channel 4 in the 90s, from The Word and early morning sensation The Big Breakfast, to Father Ted, Brass Eye and future megastars Ricky Gervais and Sacha Baron Cohen

Davina gives us a tour of Channel 4 in the Noughties, from Come Dine with Me, Skins and outrageous social experiments, to the digital-age desire to know every last detail about other people's lives

Jimmy Carr takes us through Channel 4 in the 2010s, from must-watch reality TV and radical drama, entertainment and comedy, to the nerve-racking experience of a first date and Hollywood handshakes