Great question — answering as the UphillTech team:
I don't think you're quite right with how you think broadcast and cable have operated in the UK. Into the early 1980s, there were only three channels (BBC1, BBC2, and ITV) broadcast over analog FM signals - with regional transmitters showing local content or simulcasting national content. A fourth channel was added in the early 80s, and a fifth in the late 90s - about when digital transmissions started in the UK. This is similar to the US network system - the major players being ABC, CBS, NBC, and PBS - though local affiliate stations would also partner up with the major networks. The problem of the old analog system was bandwidth - one station/network needed a wide frequency band, and...
Full answer by HorusKol: https://movies.stackexchange.com/a/120197 (CC BY-SA 4.0).
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