Rediffusion was a major operator. In order to subscribe, naturally, you rented your set from Rediffusion. Smaller towns (eg Grimsby) seemed to disappear with the migration to colour/UHF, but larger towns (eg Hull) were using the system for relay untill the mid-80's. In Hull the post 625 chane lineup was BBC1, BBC2, Anglia and Yorkshire. Post '74 Tyne-Tees substituted Anglia and Yorkshire became the Belmont version. The radio was certainly, Light, Home, Third and BBC Radio Humberside (Redifussion Channel "B"), not sure about Radio 1.
The technical distribution was to a (small) rotary switch selector, usually mounted in the window-frame.
I remember the house I grew up in had one of those dials on the wall. It was redundant by then though (I'm talking late 80s early 90s), so I don't remember the service itself. I also remember Rediffusion's Hull building being derelict, no doubt because the service had closed down.
There's a good reason Tyne Tees was the second ITV channel after 1974 - you could actually pick it up on an aerial.