One

"One" is the 1047th episode of Casualty and the 43rd and final episode of the 31st series. It will be an hour long episode centring around Lisa "Duffy" Duffin showing two teenage girls around the department.

Although the episode won't be filmed and aired live, it will be filmed in one take, as one hour long scene. The live aspect of the episode is the fact it will take place in real-time, much like the events of the series 25 episode "Momentum". However, the latter wasn't filmed as one scene in one take.

Filming takes place in April 2017.