This morning at 8:10am, we started seeing increased latency and packet loss between our network and BT internet. This settled down at 10:34am.
Some diagnostics showed the problem to be around the London area, possibly at the interconnect of Global Crossing and BT.
BT have raised this as a fault as seen at the following link:
http://btbusiness.custhelp.com/app/service_status#issue21737
You can also see the graph for the latency and packet loss below.
Latency and Packet loss