The BBC production crew was unable to obtain permission for the British Ministry of Defense to use the proper RMP crest for the production. They had to design a new crest that was at least 35% different from the real one.
Tim Oglethorpe's column in the Daily Mail in April 2018 reported that there would not be a second series despite high viewing figures.
At 5:45 into episode 1, Lt. Laithwaite is seen holstering a Webley revolver as part of his uniform in 1965 Aden, despite the fact the Webley had been withdrawn from British military service by 1963, having been replaced by the Browning Hi-Power pistol.
Essie Davis who plays reporter Martha Franklin and Richard Dillane who plays MI6 operative Harvey Tilbrook co-starred in The White Princess.