Charlotte Salt (The Tudors) joins the cast as Sam Nicholls, an ambitious Army medic on secondment. She begins by joining a paramedic crew for the day, but has to rely on her military training when an aggressive driver rams the ambulance off the road. Meanwhile, Noel is keen to increase security after a run-in with an angry patient, but an encounter with a grieving mother (Tracie Bennett) changes his mind (thetvdb.com)