Anthony Eden (1955–57)
Harold Macmillan (1957–63)
Alec Douglas-Home (1963–64)
Harold Wilson (1964–70)
Edward Heath (1970–74)
Harold Wilson (1974–76)
James Callaghan (1976–79)
Margaret Thatcher (1979–90)
John Major (1990–97)
Tony Blair (1997–07)
Gordon Brown (2007–10)
David Cameron (2010–16)
Theresa May (2016–19)
Boris Johnson (2019–22)
Liz Truss (2022 (two days ago) - current)
Quite the reign! Can't help but feel a bit sad really.
I suspect that you don't realize how bizarre this phrasing is for the vast majority of the world.
There are many countries in the world who run different system of governments, and many as doing it quite successfully.
That phrase implies that she had PMs subservient to her. That's not how the UK monarchy is generally explained, at least not outside of the UK.