As Sky have bought O2/Be's landline/BB business I thought I'd bump this.
I'm nobody's cheerleader but Sky are admitting problems at an exchange in Leicestershire that I know of. BT aren't - they say its fine.
The issue is that neither Sky or BT have 10GigE ports on their equipment. The exchange is FTTC enabled and "issues" have been ongoing for months. The fix is to upgrade from GigE to 10GigE ports - for non-techies this is an extremely expensive operation for a lot of reasons.