The title of this episode is taken from a notorious comment made by UK prime minister Neville Chamberlain in a radio broadcast on 27 September 1938, in which he described Germany's invasion of Czechoslovakia as "a quarrel in a far away country between people of whom we know nothing".
Claire Foy (Lady Persephone Towyn) & Ed Stoppard (Sir Hallam Holland) also worked together on The Crown (2016) as Queen Elizabeth II & Tony Longdon respectively.