No clip was faked. Every single line in our film was found in the BBC Archive and had been broadcast on the BBC. This creates a uniquely special feeling as you watch, but was a mammoth undertaking.

Over 250,000 clips were pulled from the archive and watched by a team of over 20 researchers. We also used an AI tool trained on over a million images from the archive to search for visual clips which didn’t have searchable dialogue. It was a hugely complex task. A difficult, brilliant jigsaw puzzle.

Once a clip was found, it had to be approved and cleared by anyone who appeared where appropriate, as well as sourcing the original sound sync from many of the clips from production companies.

That the film feels as effortless as it does, even though behind the scenes was so complicated is testament to the production of the film