The Secret War: Season 1, Episode 1

1 - 1: The Battle Of The Beams

The mysterious radio signals from Germany which could guide enemy night bombers to a pin-point target anywhere in the British Isles could have proved disastrous for the almost non-existent British defences. Professor R.V. Jones of the RAF Scientific intelligence recounts how the "Beams" were first discovered and then countered...with crucial timeliness.