The monarch, who wore a bright yellow floral dress, chatted to Morrison Tuesday in the royal residence’s Oak Room.
The queen is also monarch of Australia, part of the Commonwealth club of 54 nations.
It’s been a very busy week for the 95-year-old queen, who travelled by train to southwest England’s Cornwall on Friday to host an evening reception for world leaders attending the Group of Seven summit.
The action-packed weekend is a contrast to much of the past year, which saw the queen holding scores of online audiences from her residence because of the pandemic.
Morrison also held talks in London with British Prime Minister Boris Johnson. The two announced Tuesday the broad outlines of a new free trade deal that eliminates tariffs on a wide range of goods.