Where was Operation Crossbow filmed?

1965 film by Michael Anderson

Operation Crossbow (1965) was filmed in Canton of Jura, King's Lynn, Holkham National Nature Reserve and Gorges du Pichoux, 4 places named in its Wikipedia article, in the United Kingdom, Switzerland. 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