If you are on 20CN then the current debacle hasn't affected you - you are still on the "BT will drop the IP profile immediately but will think about it for 3 days before raising it system"
It's not BT's profiling that's causing the issue, it moves up OK after a sync increase but the throughput doesn't it still remains as though it was on the previous/lower BT IP profile.
So are you saying that PN doesn't have their own IP profiling for 20CN connections?