The shout reminds Iain of Mia, a girl who ended her life (Picture: BBC)

Back in a 2018 episode of Casualty Iain Dean (Michael Stevenson)’s world started to fall apart when he was called to a woman who’d jumped off a motorway bridge, killing herself and causing a massive road accident. The incident led to the death of his former partner and fellow paramedic Sam Nicholls, who died in his arms.