Where was The Final Problem filmed?

2017 episode of Sherlock directed by Benjamin Caron

The Final Problem (2017) was filmed in Pinewood Studios, Tenby, St Catherine's Island and St Catherine's Fort, 4 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.

See them on the map → Wikipedia Source data