That's the end of the world, then. The British nuclear deterrent will launch when Radio 4 on long wave stops.

https://www.forcesnews.com/services/navy/nuclear-promise-let...

> The process by which a Trident submarine commander would determine if the British government continues to function includes, among other checks, establishing whether BBC Radio 4 continues broadcasting [on long wave]

> Submarines on patrol were reported to have briefly gone on nuclear alert in 2004 when Radio 4 went off the air for 15 minutes due to a power cut.