Lara Pulver and Anna Chancellor have both played Irene Adler in different Sherlock Holmes adaptations.
Lara Pulver and Anna Chancellor have both played characters in MI-5 (2002), playing Erin Watts and Juliet Shaw respectively.
Three actors in this series are alumni from Band of Brothers (2001), Dominic Cooper, Phil McKee and Wolf Kahler.
This is the second time actor Samuel West plays a character with a connection to Ian Fleming, in Any Human Heart (2010) his character introduces Logan Mountstuart to the naval officer Fleming, here he plays Fleming's commanding officer.