Where was The Lady Vanishes (1938) filmed?

1938 film by Alfred Hitchcock

The Lady Vanishes (1938) was filmed in London, Great Britain, London Borough of Islington, Islington, Shepherd's Bush, Gainsborough Pictures and 3 more places, 9 places named in its Wikipedia article, in the United Kingdom. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

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