Factual error: Michael's impending 18th birthday is often mentioned as the time he becomes an adult and can make his own decisions. The age of majority in 1922 (and until 1970) was 21.
Factual error: Major Campbell heads the Irish branch of the secret service, but reports to Winston Churchill, the Colonial Secretary. The Colonial Office had nothing to do with Ireland, which at that time was part of the United Kingdom.
Episode #2.1 - S2-E1
Factual error: Season 2 covers 1921 to 1922. The car (YP8086) used in this episode was first registered 9th August 1926. (00:38:20 - 00:39:30)
Episode #2.1 - S2-E1
Factual error: Tommy refers to London at the south end of the Grand Union canal. However, the Grand Union in 1921/22 was what is now the Leicester branch. The Grand Union as it is known now was an amalgamation of 7 canals in 1929.
Episode #2.2 - S2-E2
Factual error: Tommy's service record quoted by Churchill says that he served throughout the war with the Warwickshire Yeomanry. But we already know that he was a tunneller on the Western Front. The Warwickshire Yeomanry was a cavalry regiment (which actually served in Egypt, Gallipoli and Palestine and finally as a machine-gun battalion on the Western Front at the very end of the war). All tunnellers served with the Royal Engineers.
Episode #2.2 - S2-E2
Factual error: Tommy tells Churchill that he served at Verdun and several of Churchill's assistants say that they did too. There were no British troops at Verdun. It was a battle between the French and the Germans.
Episode #2.5 - S2-E5
Factual error: The Metropolitan Police officers who arrest Arthur in Camden Town are wearing the spiked helmets of the Birmingham City Police, not the boss-topped helmets of the Metropolitan Police, which we do see at other times.
Episode #2.6 - S2-E6
Factual error: The field marshal is wearing a revolver to the Derby. British soldiers are only ever armed on duty, certainly not when attending social events. He also wears his Sam Browne outside his shoulder strap instead of beneath it; no officer would do this.
Episode #2.6 - S2-E6
Factual error: Tommy's warrant is signed by the 'Minister of the Empire'. There was no such post. The Colonial Secretary dealt with the British Empire.
Answer: There has never been prohibition in England. There are many reasons for running an underground distillery. It would be a way to avoid things like government regulations, safe distilling methods, alcohol content limits, taxation, fix pricing, and so on.
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