Where was Bitter Harvest (1963) filmed?

1963 film by Peter Graham Scott

Bitter Harvest (1963) was filmed in Cardiff and Hampstead Heath, 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.

See them on the map → Wikipedia Source data