After my last post, the good news is there appears to be a rebate for some of the 20CN bandwidth on 20CN only exchanges. This is BT's wonderfully simple pricing at work! We are reviewing what this works out at exactly, but it looks like it gets a lot closer to breaking even than we expected, for now.
This gives 20CN a bit of a reprieve, at least for a few months.
However, the underlying problem remains that the 20CN is a reducing number of lines and has its own separate back-haul billing. So the end game is the same. Even if you got to as low as £50/Mb/s/month then that last one 8Mb/s 20CN line would cost us over £400/month, and as we reduce to fewer and fewer active 20CN lines, the costs get closer and closer to that level.
So, at some point, probably this year, we have to come up with a solution for how we handle the last 20CN lines. Right now, we'll leave pricing unchanged.