As Charlie is having flashbacks to his life as a teenager and goes to the Casualty department to visit his mother, he walks past a man in a tweed jacket, with short grey hair. Although this man is only seen from behind, the cultured Yorkshire accent when he calls out "Are you looking for someone, lad" makes it clear that this is Ewart Plimmer, the casualty consultant who appeared in Series 1 of Casualty (1986).
First appearance in third season for Cathy Shipton as Lisa Duffin.