By Lizzy Buchan Rishi Sunak has admitted that he’s failed miserably to keep his promise to slash NHS waiting lists after being challenged by Piers Morgan over his elderly mum’s experience. The TalkTV presenter confronted Mr Sunak over his 79-year-old mother’s hospital stay after she had a heart attack, where she waited on a trolley in a hospital corridor for nearly seven hours. He told the PM it was “a scene out of a war zone” during an interview in Downing Street. Mr Morgan said: “She was put on a trolley in A&E, in a corridor, for nearly seven hours. The heart monitor battery ran out. Nobody…