Their Finest Hour and a Half Filming Locations

Their Finest Hour and a Half was filmed in the United Kingdom

Porthgain Harbour as Dover Harbour

Catrin and Tom talk while the crew films establishing shots and later they get into an argument under the full moon.

Source: IMDb

Pinewood Studios as Pinewood Studios

Catrin serves as the on-set writer when the production moves to the studio.

Source: IMDb