CNN:
Sunak then announced he was bringing Cameron back to frontline politics as foreign secretary, in a stunning move that has few parallels in recent British political history.
Cameron served as prime minister from 2010 to 2016, resigning after Britain voted to leave the European Union in a referendum that he had called.
So we're told that kind of move--appointing a former PM to a 'mere' minister role-- is uncommon. When was the last/prior time that that happened?
The BBC has a hint, but is not super explicit:
It was Lord Cameron's appointment that stunned Westminster and made him the first former prime minister to re-enter government since the 1970s.
So who's that referring to?