Where was Thomas & Friends: The Great Discovery filmed?
2008 film by Steve Asquith
Thomas & Friends: The Great Discovery (2008) was filmed in Shepperton and Shepperton 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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Studios & sets
Shepperton Studios
United Kingdom
Film studio, special effects studios and pre- and post-production centre
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Towns & cities
Shepperton
England
Town in Surrey, England, UK
“Filming of the special took place at Shepperton Studios in Shepperton, England, where it had been filmed since the television show's second series.” Wikipedia