Rewinder: Endless Pips

In a week when the Government announced that it will test its emergency alert system on mobile phones, Greg James looks back to the nervy days of the Cold War and uncovers the recordings to be played out on the radio in case of a nuclear attack. He also revisits previous adaptations of Great Expectations, and uncovers a huge conspiracy - the BBC seems to adapt the Dickens novel every 10 years, going right back to 1959