That's brutal, and I thought mine was bad only able to achieve 13Mbps average on Infinity.
How far are you from the exchange?
About 3.5km for ADSL2, currently has a sync of 4544/947. Tried infinity when it was first available 3 years ago, estimate then was 10-14, got 5Mb/0.5Mb, had infinity removed a week later and back to adsl since then!
Infinity cabinet is about 1500m down the road.
Rural broadband has been and gone, BT came in under budget here (yay ), so I've been screwed over twice, once with this pathetic offering, and second because it was *activated*, it wasn't part of the rural rollout. I'm not really rural anyway, it's just a long (main) road.