Hi Chris,
We had similar problems here in South West England. Apparently some people were still having problems related to this issue earlier today. Here's my (b)log of my attempts to get to the bottom of it, thus far without much success.
The story I heard most recently is that 3 authentication servers went down, and a large number of customers with static IPs and ultimately reliant on BT Wholesale were affected. The number 2 million has been mentioned to me. When things did burst back into life these unfortunates got allocated dynamic IPs instead of their much loved static ones.
Cheers,
Jim
