The BBC made a drama, "Micro Men" (2009), about some of the behind-the-scenes drama behind the BBC Micro. As I recall, it doesn't explain the whole Fred, Jim and Sheila thing though.
Just watched it last night, it's pretty good. Though does anyone have any context for the scene with Sinclair and the 3 women in the convention? It seemed a bit out of place in the whole doc.
BTW, Silicon Cowboys is another film I'd recommend. It's about the history of Compaq.
It's a reference to the fact that Sinclair was a notorious womanizer, and his exploits often ended up in the press of the time. He was also chairman of MENSA from 1980 to 1997.
The closing scene is priceless. Clive Sinclair defiantly drives into the future on his C5, without helmet or neck support, overtaken by lorries/juggernauts:
Martin "Bilbo Baggins" Freeman is in it.
https://www.youtube.com/watch?v=XXBxV6-zamM