Mark Hollingsworth is an investigative writer and journalist. He is the author of seven books and two reference books, notably 'Defending the Realm - MI5 and International Terrorism', 'Thatcher's Fortunes - The Life and Times of Mark Thatcher' and 'Saudi Babylon - Torture, Corruption and Cover-Up Inside the House of Saud'. He contributes to the Guardian, Financial Times, Independent on Sunday and Sunday Times, and for five years worked for Granada TV's 'World In Action' programme.