 When confronting Lucy about her husband's fictitious life history, Vivien Rook refers to the fall of Harriet Jones, who first appeared as an MP in "Aliens of London" before being elected Prime Minister by the time of "The Christmas Invasion".Although that episode hinted at her downfall due to the Doctor's intervention (due to her having a vote of no confidence in the House of Commons), this episode confirms it, mentioned as being at the same point that the Master appeared.In his first cabinet session, the Master refers to the reconstruction of the Cabinet Rooms and Downing Street, which were destroyed at the climax of "World War Three".