Episode #2.3 - S2-E3
Other mistake: When the mother of a boy Arthur beats to death while boxing comes for revenge, she fires a single shot from a six-shot revolver at Arthur's head. Arthur then takes the revolver from her, ejecting 6 unspent bullets instead of 5. (00:28:24)
Episode #2.3 - S2-E3
Continuity mistake: The bullets on the table change positions during the scene after they stopped moving. For example, when Arthur moves the glass, you see 5 between him and the glass. In the next shot, you can't see any of the bullets, even though you see the same area. They're back when she flips the table.
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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