Where was Elizabeth R filmed?
TV miniseries
Elizabeth R (1971–) was filmed in Television Centre and Penshurst Place, 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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Landmarks & buildings
Television Centre
England
Television studio complex in West London, England, UK
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Castles & palaces
Penshurst Place
England
Historic building near Tonbridge, Kent in England
“Elizabeth R was filmed at a variety of locations including Penshurst Place which doubled as the queen's castle grounds and Chiddingstone in Kent, though all the interiors were recorded at the BBC Television Centre.” Wikipedia