I understand that Sir Percy Bates passed away in the evening of 15 October 1946, the day before the maiden voyage of the Queen Elizabeth. He suffered a heart attack at the age of 67 while at work and died later that day at his home.
Had it not been for his vision and foresight, the Queen Mary and Queen Elizabeth may not have been built.
According to the obituary that appeared in The New York Times on 17 October 1946, Sir Percy suffered a heart attack in his office on 15 October, while making final arrangements for QE's maiden civilian voyage, and died at home the next day, which WAS QE's sailing day. His luggage was already on board the ship.