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|Airdate||20 November 2004|
|Previous||"Horses For Courses"|
"Past Imperfect" was the twelfth episode of Series 19, and the 458th episode of Casualty overall.
Harry starts the investigation into what happened to the patient who suffered a cardiac arrest. Abs and Ellen are interrogated by Harry and desperate to stay in the country Ellen says she will cover for Abs but only if he marries her. Facing been struck off Abs reluctantly agrees. Also Comfort discharges herself from hospital determined to keep her pregnancy a secret.