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I guess the BBC would notice this pretty fast - they have a microphone live broadcasting the bells for the beginning of the radio news

• iaskwhy 11y ago
  From the article: "The incorrect chimes had caused interruptions to BBC Radio 4, which broadcasts the sound of Big Ben live."
• pidg 11y ago
  As I understand it the microphone is connected to two always-on telephone lines (second one as a backup).