Key term for Edexcel GCSE History, used in Historic Environment: London and WWII.
London's subterranean railway system, which served as a deep-level shelter for roughly 4% of the population.
London Underground (the Tube) appears in Edexcel GCSE History revision content for Warfare and British Society and London WWII, especially Historic Environment: London and WWII and London During the Second World War.
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