Peggy, 85, arrives at the hospital by ambulance, having injured her knee at home. It's the second time she has fallen in two months and medics want to find out if there's a more serious underlying cause. Meanwhile, the team keeps a close eye on 75-year-old Bob, who has had a suspected heart attack, and Ben, 25, isn't overly concerned by his swollen finger, until a doctor diagnoses cellulitis