Turn on the TV at 6:00 this evening and you’ll find the local news, SportsCenter, or perhaps an old Seinfeld rerun. But until this day in 1957, British TVs at 6:00pm wouldn’t show a thing. Thanks to a post-war BBC policy known as the “toddlers’ truce,” stations would not broadcast between 6:00 and 7:00 in the evening to give parents a chance to put their children to sleep before the evening programming.
via The Toddlers’ Truce: Why You Couldn’t Watch British TV at 6pm Until 1957 – Mental Floss.
