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Lacock. Not only is this small Cotswold village Meryton (Pride and Prejudice) AND Hogsmeade (in certain scenes), but it also has one of the coolest neighborhood pubs I've ever been in. AND parts of Snape's potions class were filmed in Lacock Abbey. Beat that.
St. Pancras Station: where the Weasley's magical Ford Anglia takes off in The Chamber of Secrets