I live in Cardiff, which is an old CableTel heartland.
Where I live particulary there seems to be a fair bit of what I think is former Rediffusion cabling (thick cables slung house-to-house, ocassional cables cross-street chimney-to-chimney, odd cable accross somebody's garden wall etc). Granted a lot of this infrastructure has now been removed, but it surprises me how much of it is left lying around. I noted in a lot of circumstances that the underground cabling undertaken by CableTel in the 90s seems to have used holes/cable clips on houses themselves that would have been used originally by the narrowband network.
I know that the narrowband network passed from Rediffusion/British Cable to Maxwell Communications and Metro Cable TV Ltd in the 80's, and then Metro Cable was aquired by CableTel in the 1995
. i.e. both the Rediffusion and 'new' networks were owned by CableTel. It surprises me that despite VM and predecessors owning this network, that so much of it is still up there.
Also, does anybody know what became of Metro Cable? Ironically the above link describes Metro Cable's win of the North Wales/South Cheshire franchise back in 1998, which is where I am from. There are a number of unbuilt franchises I know, just seems odd that is the only documentation I can find about it.