We are seeing continuous packet loss (~10-20%) on TalkTalk Wholesale lines on the Kennford Exchange. This has been reported to TalkTalk and they have reported back that they see a possible network problem at their end.
This is still happening.
BT have updated us saying there are no further updates, but they have escalated it and they will send an update tomorrow.
Fault fixed. Problem was with line card. TalkTalk are still doing some diagnostics on these lines though.