Witnesses tell of the worst civilian tragedy on the Home Front - the Bethnal Green Tube Disaster, in which 173 people were crushed to death in a crowd fleeing an air raid that never happened. Plus, the moving stories of two couples whose love letters to each other throughout the war prove that the pen really is mightier than the sword, and antiques expert Tim Wonnacott continues his search for the everyday wartime objects that have become collectables.