We're seeing odd routing problems and packetloss between us and BTs network - eg to IP addresses that BT host for their servers or broadband services, not our links to BT for our broadband services. We are investigating.
This would be affecting some BT retail customers using us for L2TP services, and also our customers trying to access some services that BT host.
We were seeing packet loss to some BT IP addresses over LINX and transit, we guess BT had a problem routing back to us somehow. However, routing has been stable since 10:45.
This seems like the problem was at BTs end, we've heard from other ISPs who had similar routing issues to/from BT's network.