What you are describing for MK sounds a bit like what my Dad had in the mid 80's...
In Barrow (in Cumbria) there was a company called rediffusion and their system was a cable system that you could get the radio and TV on (with a switch on the window sill that fed to the TV set). It got switched off at some point and a chap knocked at the door to say that they were switching it back on and you can get 6 new channels. You got sky channel, childrens channel and a sports channel (eurosport?) from what i can remember.
eventually they came back around a few years later and said that you will need a Cable Ready TV set (one with UHF and VHF tuners). They removed the switch on the window sill and plugged the cable into the TV set. that worked for a bit before they increased the signal coming from the local TV transmitter and then it just went off... my Dad still has the Sony Cable Ready TV in his loft...
Did anyone else have that?
EDIT: just found the link for it:
http://www.digitalspy.co.uk/forums/s...ad.php?t=64039
http://www.rediffusion-television.co.uk/
I called my Dad who said it was called Starview and was early SKY TV. It ended in 1988 when some fella cut the wire down the street. He also said it cost £400 for the TV set...