During one of my moments of utter rage at BT this weekend I emailed their CEO to complain.
Long story short after a few calls to and fro, I finally had the 'fault clear' call today from one of their senior complaint dealing bods and everything was explained to me, ie the reasons for the issues this weekend, their work in resolving it (they've merely re-routed the traffic, there is a few weeks work to resolve whatever exact issue they're getting). I was also thanked for bringing a severe network issue to that level of BT as it's allowed them to get the ball rolling sooner than they normally could. Whether or not that's true I don't know, but I was impressed with the way everything has been dealt with. Certainly better than the severe issues I was having with Virgin.