We can put it into a Canadian perspective, too, with HM The Queen of Canada's Prime Ministers;

1. With The Rt. Hon. Louis St-Laurent:


2. With The Rt. Hon. John George Diefenbaker:


3. With The Rt. Hon Lester B. Pearson:


4. With The Rt. Hon. Pierre Trudeau:


5. Missing a photo of The Rt. Hon. Joe Clark
6. Missing a photo of The Rt. Hon. John Turner

7. With The Rt. Hon. Brian Mulroney:


8. Missing a photo of The Rt. Hon. Avril Phædra Douglas "Kim" Campbell

9. With The Rt. Hon. Paul Martin:


10. With The Rt. Hon. Stephen Harper:


Now, I know for a fact, that both Mr. Clark and Mr. Turner have met The Queen. I have seen Mr. Clark with Her Majesty. Mr. Turner has met The Queen on countless occasions, including when he was PM in 1984 and went to London to advise HM to postpone a scheduled Royal Visit to Canada because of an impending election.. I do not know of Ms. Campbell ever met The Queen while Prime Minister, but she did meet The Queen while a Cabinet Minister during a Royal Visit.