We have started to see yet more congestion on BT lines last night. This looks again a bit like a link aggregation issue (where one leg of a multiple link trunk within BT is full). The patten is not as obvious this time. Looking at the history we can see that some of the affected lines have had slight loss in the evenings. We did not spot this with our tools because of the rather odd pattern. Obviously we are trying to get this sorted with BT, but we are pleased to confirm that BT are actually providing more data now that shows where each circuit will use network components within their network. We plan to integrate this soon so that we can correlate some of these newer congestion issues and point BT in the right direction more quickly.