Factual error: The local police constable wears the divisional letter 'H'. H Division of the Metropolitan Police covered Whitechapel. While it is never specified where the upper middle-class Cherry Tree Lane is, it's certainly not in Whitechapel, which was a solidly working-class district in the heart of the East End. He also wears his letter and number on his helmet plate, a 19th century practice that had been abolished by 1910.
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