That's British PM Margaret Thatcher with Reagan.
He’s referring to post #22.
That’s the Queen, not Maggie.
Thatcher is with Reagan in #17. In #22, it’s Queen Elizabeth II — or, as we know her here in Canada: Her Majesty Elizabeth the Second, by the Grace of God of the United Kingdom, Canada and Her other Realms and Territories Queen, Head of the Commonwealth, Defender of the Faith.