This episode told the same events as Charlie's Anniversary (2007) but seen through the eyes of new doctor Toby De Silva.
It was originally intended that the explosion in this episode would be caused by Muslim terrorist suicide bombers. However following the real-life attack on Glasgow Airport on 30 June 2007, when a burning car loaded with gas cylinders was driven at the main terminal building by Muslim doctors, the perpetrators were changed to animal rights terrorists, and the relevant scenes were re-shot.
No director was credited for this episode.