Mark Hollingsworth has been an investigative journalist, historian, journalist and documentary film-maker since 1984. He is the author of 10 books, notably 'Londongrad - From Russia with Cash', 'Saudi Bablyon - Torture, Corruption and Cover-Up Inside the Saudi Royal Family', 'Defending the Realm - Inside MI5 and the War on International Terrorism', "MPs for Hire' and biographies of Mark Thatcher and Lord (Tim) Bell. He is also a regular contributor to 'The Times', 'Mail on Sunday', 'The Guardian', 'Daily Telegraph' and 'Sunday Times' and has written feature articles for 'Tatler', 'ES' magazine, the 'New Statesman' and 'The Spectator'. And he made numerous documentaries for Granada TV's award-winning current affairs programme 'World In Action' in the late 1980s and early 1990s.