Nope just regular "up to 8Mbps" connection. No nasties on the PC (I work in IT, so have more than enough experience there), nothing else connected according to my router.
Router is synched at 7616000 down as usual.
My little exchange never suffers from congestion, so I can only think the problem is at Zen's end. I know there are some peering issues to the US at the moment, but it's affecting UK sites.
ZeN 8000 Pro
Draytek Vigor 2600G