Portrayed by Ed Stoppard, Sir Hallam Holland is a Foreign Office diplomat, who inherited 165 Eaton Place as well as a large fortune and a baronetcy.
Sir Hallam's relationship with Lady Agnes is tested during series 2 when she becomes friendly with an American tycoon, Casper Landry.
In light of the sad news she holds a dinner party whose guests include a young John F. Kennedy and American businessman Casper Landry.
Becoming a fascist, she has an affair with Harry Spargo, but later leaves him and her family to go to Germany with Joachim von Ribbentrop as his mistress.
She is absent from Eaton Place between series 1 and 2, maintaining only minimal contact with her family, but returns in December 1938 after the anti-Semitic violence in Germany escalates.
Exposed as a spy for the Germans and left alone, she commits suicide—by throwing herself off the upper balcony onto the entrance hall floor—after accidentally shooting Beryl with Sir Hallam's service pistol.
Initially, Sir Hallam has been told by his mother that Pamela died in childhood, but he comes across her while attempting to remove Lotte from the same asylum.
She took the lead in helping relocate Jewish children after the intensification of antisemitic Nazism within Germany, and is also an expert Egyptologist.
It comes to a head when Mr. Prichard scolds her for calling a young John F. Kennedy "my dear" and she resigns in a fit of temper.
As a former wartime ambulance man, he delivers Lady Agnes' baby with little fuss when she gives birth before preparations have been made.
This fact angers Mr. Amanjit and Mrs Thackeray and a rift emerges downstairs, however they soon forgive him after a talk from Lady Agnes.
Eunice, portrayed by Ami Metcalf, is hired as kitchen maid between 1936 and 1938, and is an established member of the household by the start of series 2.
She gets into Mr Pritchard's bad books very quickly after she arrives and this comes to a head when she contacts a union about the long hours she and Eunice are expected to work and their poor living conditions.
She falls in love with Harry and they plan to marry and emigrate to America, but Beryl is accidentally shot by Persie before the latter commits suicide.
Beryl and Harry are married in the final episode and decide to stay in England and help the war effort.
In Series 2, Blanche's firm nature and apparent disregard for her late half-sister's memory initially causes friction with Mr Amanjit but when they work together to evacuate Jewish children from Germany they learn to respect each other and are soon friends.
Sir Hallam gives Mr Amanjit his service pistol, entrusting him with protecting the Holland household in the event of a German invasion.
Just 15 years old, orphaned Ivy Morris is spirited, wilful, and likes red nail varnish and singing in the bath.
He enjoys a cautious camaraderie with Sir Hallam, but this is put to the test in 1936 by his involvement with Oswald Mosley's British Union of Fascists.
Harry and Beryl are married in the final episode and decide to stay in England and help the war effort.
Aged 16, Johnny Proude launches a career in domestic service in an effort to escape a life spent mining coal.
Reserved and sophisticated, having been a university lecturer in pre-Nazi Germany, Rachel knows little about basic household chores (though she has little tricks that surprise the rest of the staff), but is determined to make the best of her circumstances.
Lotte Perlmutter is the daughter of Rachel, and when her mother dies of an asthma attack, she is taken into the Holland household as Sir Hallam's ward.