To commemorate the twentieth anniversary of the death of Diana, Princess of Wales, Songs of Praise celebrates how she broke down barriers through her amazing charity work and meets those who benefitted. At the Mildmay HIV Hospital in London, Pam Rhodes talks to a nurse and the mother of a patient who Diana met before he died. Sally Magnusson journeys to Nepal to discover the impact Diana made by shaking hands with patients who had leprosy, and Aled Jones takes a personal tour of the newly created memorial White Garden at Kensington Palace.