This article covers a real-world subject which should not be taken as part of the Holby universe.
"Lie Low" is the 668th episode of Casualty and the 30th episode of the 23rd series.
Synopsis[]
Flashbacks reveal the events preceding Big Mac's arrest, as violence and intimidation on the Farmead Estate entangled the porter in gang warfare. As the threats against him escalate, he realises his friendship with Jessica puts the nurse at risk as his past returns to haunt him.