Where was The Lonely Lady filmed?
1983 film by Peter Sasdy
The Lonely Lady (1983) was filmed in Middlesex and Twickenham Film Studios, 2 places named in its Wikipedia article's Production section, 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 Production section
Wikipedia’s Production section names 2 places. Each links to the sentence that says so.
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Towns & cities
Middlesex
England
Historic county of England
“Interiors were shot at Twickenham Studios in Middlesex, England.” Wikipedia
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Studios & sets
Twickenham Film Studios
England
British film studio