Mi5 use to get resistance from Royal Mail about intercepting letters and so warrants had to be applied. The numerous methods of communicating (another one is multiple people logging into webmail and using drafts and not sending the email). Encryption would only encypt the message but not the fact that a message was sent, but for evidence gathering (especially proof of intent when preventing crime) it is important. Besides, wont quantum computers make the current infrastructure useless anyway?
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