You Always Hurt the One You Love

"You Always Hurt the One You Love" is the 860th episode of Casualty and the 38th episode of the 27th series.

Synopsis
Lloyd is determined to uncover the truth about a cannabis factory on his final day as a nurse after a seven-year-old boy is brought to the ED with suspected poisoning. Meanwhile, Tess and Fletch try to counsel a feisty young couple, and a patient's beloved pet mouse is accidentally set free in the hospital.