From that Wiki article: "[...]the process by which a Trident submarine commander would determine if the British government continues to function includes, amon

From that Wiki article: "[...]the process by which a Trident submarine commander would determine if the British government continues to function includes, amongst other checks, establishing whether BBC Radio 4 continues broadcasting.[4] Submarines on patrol were reported to have briefly gone on nuclear alert in 2004 when Radio 4 mysteriously went off the air for 15 minutes.[5]" Wow.