I found it very interesting and will have a good look at that site.
Rediffusion were called British Cable TV by the time that I joined them back in 1987 they had a few name changes and were part of the BET group of companies. They were bought by Robert Maxwell around that time who asset stripped the company, I am not sure of the full details but he paid say £1M for the entire company and sold one of the buildings for around £750K shortly after. Maxwell sold parts of the company ie: Guildford and Cardiff to Insight communications. When Maxwell died there was a management takeover and the company changed name from Maxwell Cable to Metro Cable, the directors paid less than £1M for the company from the administrators and sold half of the company around 3 years later to CableTel who then bought ntl and used the ntl name.
To put th ntl history into context, the broadcast side used to be the "Home Office" before it was privatised by Maggie, and the Residential cable side was owned by the parent company Ocom communications in the states, they formed Insight communications over here and later changed the name to CableTel, when CableTel bought NTL they used the name but changed it soon after to ntl.
I was told that the first Cable TV system was in the Rhondda valley!
I have also worked on the old system in Bristol, mainly at the headend they had with the pair of 3.7M dishes when they were running programs like Music Box, the original Sky channel and movies on tapes a few years before Astra 1 was put into orbit.
The old Rediffusion company also had an interactive system back in the 80's and an 860MHz broadband system in the Rhondda in the very early 90's, some of the shestring stuff we did was way ahead of ntl including the VOIP telephone trials we were doing. It's a pity things didn't work out differently because being bought by the Americans ie: ntl/CableTel actually stopped a lot of development in this country and put us back many years.
