
We are two decades on from the Downing Street duology - part 1 being aired on 16th and part 2 on 23rd April 2005. It was the first multi-part story in modern Doctor Who.
It featured the first appearance of Toshiko Sato and Harriet Jones, as well as the Raxacoricofallapatorian species. It also marked the reintroduction of UNIT and was the episode which started the tradition of "present day" stories being set one year into the future of their broadcast dates.
What are your main recollections?