We never really did get to the bottom of how many, I really do suspect that huge numbers are unaware as they probably put it down to their WiFi connection (only us geeks use wired I believe) I may be wrong though.... It is only a few that chat on here about it, but I doubt we'll ever know the full extent, but affected people keep crawling out of the woodwork, and I believe people continue to get migrated without anyone understanding the nature of the problem.
To be fair, 'eventually' Zen have taken my case seriously, and that seems to have happened to everyone who shouts loudly enough, not the ideal way though.
There do seem to be wider issues around service and billing, but for me it wasn't SO (!) bad.....
For now, much the same as everyone it's wait and see, I was with Zen FTTC in Norfolk for about 8 years, and never had any real reason to complain, and I believe that this is mostly a NorthWest based problem, but not actually just so.
I am about to make a change to my network so that the GEA line gets rather more use (will point my Servarr data through it, so that will be quite heavy), it will be interesting to see what that does to disconnections etc.
ZeN