"Vital Spark" is the 45th episode of Casualty and the 5th episode of the 4th series. It was preceded by "Day Off" and followed by "Charity". The episode was directed by Tony Iland and written by John Fletcher.
Lucy receives a letter in the post, which makes her angry – she failed her primary exams. Megan throws her pills down the toilet and Julie jokes with Jimmy that his dancing isn't up to scratch. An old poacher, Alfred Newcombe, is out with his grandson, Eric, showing him his old haunts, when he collapses. Eric drives him to A&E, where Lucy diagnoses terminal cancer called carconomotosis. Eric tries to get him and his father, Graham, to make peace, Graham says he loved him once. Later Alfred dies peacefully, with Eric by his side.