Arthur Greenwood was a Labour member of the British House of Commons from 1922-31 and from 1932-45. He was Deputy Labour leader from 1935-45. He served in Churchill's wartime cabinet from 1940-2.
Film debut of Valentine Dyall.
Film debut of Harry Locke.
Metcalfe's quote, "Night's candles are burned out and jocund says stands tiptoe on the misty mountain tops ...", is from 'Romeo and Juliet', Act III, Scene 5 by William Shakespeare.
The shot of the wooden building being blown up towards the end was from one of the British Commando raids on the Norwegian coast. These were usually to attack things like fish oil processing plants. There are various other extracts from newsreels or other reality footage inserted into the film at various points.