Ashton Down was a building where Johnson held the bodies of Jack Harkness and Rupesh Patanjali. Jack's holding cell was filled with concrete to prevent him escaping, but Ianto Jones retrieved the cell using a forklift. (TV: Children of Earth: Day Two) Johnson later used it as her base and it was where Jack defeated the 456 with a reconstitution wave. (TV: Children of Earth: Day Five)