Doctors carry out tests on 77-year-old Martin, who was rushed to St Georges after collapsing at home and suffered two further seizures in A&E. As he waits to find out what is causing him problems, his wife Margaret talks about their life together. Meanwhile, 83-year-old widower Harry arrives with shortness of breath, chest pains and dizziness after collapsing while shopping. Paediatric nurse Kelly, who loves working with children, treats six-year-old Lilly, who has cut her head after falling off her scooter.