There is not a lot of information about the final close of CCC - perhaps understandably.
This gives a small insight and comes from Tony Philpott
"I was at CCC from 1988 until it was broken up. I was the ADX manager, nothing to do with the cable or voice comms at all, but brought in by Herbie Hogbin, the last GM of CCC, to help introduce Message Switching Computers (ADX & Hermes) into CCC.
As you can see I am now working for IBM now but the old CCC still has many happy memories."