- Provided a commentary for the Doctor Who DVD "The Pirate Planet".
- Provided a commentary for the Doctor Who DVD "The Invasion of Time".
- Co-author (with David Fisher) of The Fall of Berlin.
- Co-author (with David Fisher) of Colonel Z.: The Life and Times of a Master of Spies.
- Co-author (with David Fisher) of The Deadly Embrace: Hitler, Stalin and the Nazi-Soviet Pact, 1939-1941.
- Co-author (with David Fisher) of Kristallnacht: The Unleashing of the Holocaust.
- Author of The Devil's Disciples: The Lives and Times of Hitler's Inner Circle.
- (2010) Provided a commentary for the Doctor Who (1963) DVD "The Horns of Nimon".
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