The Making Of Lifeforce (1985)
https://youtu.be/DCWRVLEMyoA?t=1342 - from the Vincent Dawn YouTube channel (22 mins long).
The video also includes The Making of Invaders From Mars from the same program. Total runtime; 44 mins.
Lifeforce Extras: Space Vampires in London
https://www.youtube.com/watch?v=JlXYn8S7-aI - from the Retro TV YouTube channel (10 mins long).
Lifeforce Extras: Carlsen’s Curse
https://www.youtube.com/watch?v=V0zSWR4FmpA&t - from the Retro TV YouTube channel (7 mins long).