Vivien Rook

Vivien Rook was an operative for the Torchwood Institute, studying the mysterious Harold Saxon for the Institude. She turned up at 10 Downing Street in April 2008 claiming to be a reporter for The Sunday Mirror and she requested an interview with Lucy Saxon. She told Lucy the truth about Mr Saxon's true life, explaining he was only in existence since Harriet Jones's downfall. However, Mr Saxon had already told Lucy about his true identity and intentions, and so Mr Saxon came in and ordered a quartet of Toclafane to mutilate Vivien.

However, she had made a contingency plan and prepared an email message to be sent to Torchwood if she hadn't returned to her desk by 10pm that day. It was retrieved by Captain Jack Harkness, The Doctor and Martha Jones on Martha's laptop. Vivien had attached the Saxon files including the Archangel document which allowed the Doctor to create a key which could make the three be unnoticed by the Master's forces allowing them to sneak onboard the Valiant. (DW: The Sound of Drums)