Where was Threads filmed?
1984 television film directed by Mick Jackson
Threads (1984) was filmed in Sheffield and Peak District, 2 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 2 places. Each links to the sentence that says so.
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Landscapes & nature
Peak District
England
Upland area in central and northern England
“The scenes taking place six weeks after the attack were shot at Curbar Edge in the Peak District National Park; because weather conditions were considered too fine to pass off as a nuclear winter, stage snow had to be spread around the rocks and heather, and cameramen installed light filters on their equipment to block out the sunlight.” Wikipedia
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Towns & cities
Sheffield
England
City in South Yorkshire, England, United Kingdom