Anthony Eden

A man named Eden was a British Prime Minister.

The Twelfth Doctor mentioned Eden as a possible candidate when asking the Landlord who the Prime Minister was in 2017. (TV: Knock Knock)

Behind the scenes

 * Though not explicitly stated in Knock Knock, "Eden" is most likely a reference to the real life Anthony Eden.
 * Eden was played by Hugh Fraser in Edward & Mrs. Simpson, Michael Gough in Suez 1956, Anthony Calf in Upstairs Downstairs and Samuel West in Darkest Hour.