Private luncheon with Prime Minister of Great Britain Harold Macmillan, Sir David Ormsby-Gore, and Sylvia Thomas Ormsby-Gore, 1:00PM. President John F. Kennedy, Prime Minister Harold Macmillan of Great Britain, and others stand with Kennedy family ponies on the South Lawn of the White House, Washington, D.C. Standing at left (L-R): Prime Minister Macmillan; President Kennedy; Ambassador of Great Britain, Sir David Ormsby-Gore; First Lady Jacqueline Kennedy; and the Ambassador's wife, Sylvia Thomas Ormsby-Gore. Caroline Kennedy's ponies, Macaroni (left, in front) and Tex, stand at right. Prime Minister Macmillan, Ambassador Ormsby-Gore, and Mrs. Ormsby-Gore visited the White House to attend a private luncheon.