Caz Graham visits the suburban Berkshire mansion which for 75 years has eavesdropped on the world. As BBC Monitoring changes, Caz hears why the organisation is leaving Caversham. Show more
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Caz Graham visits the suburban Berkshire mansion which for 75 years has eavesdropped on the world. As BBC Monitoring changes, Caz hears why the organisation is leaving Caversham. Show more