Where was Quartet filmed?
2012 film directed by Dustin Hoffman
Quartet (2012) was filmed in Great Britain, Hedsor and Hedsor House, 3 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.
Places per Wikipedia's article
The Wikipedia article names 3 places. Each links to the sentence that says so.
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Landscapes & nature
Great Britain
United Kingdom
Island in the North Atlantic Ocean off the northwest coast of continental Europe
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Castles & palaces
Hedsor House
England
Mansion in Hedsor in Buckinghamshire, England, UK
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Towns & cities
Hedsor
England
Village and civil parish in Buckinghamshire, England