"If Not for You" is the 845th episode of Casualty and the 22nd episode of the 27th series.


A familiar face arrives at Holby City as Charlie's former nursing deputy Ash, now qualified as a doctor, rejoins the team as a locum - and finds himself forced to hit the ground running after being tasked to treat a patient with suspected rabies. Meanwhile, Aoife is forced to take control of her private life when ex-boyfriend Craig turns up.