I just checked on my modem status page to try and see why my connection was so slow, and this is what I saw...
DSL Status:Connected
DSL Modulation Mode:MultiMode
DSL Path Mode:Interleaved
Downstream Rate:519 kbps
Upstream Rate:764 kbps
Downstream Margin:1 db
Upstream Margin:12 db
Downstream Line Attenuation:61 db
Upstream Line Attenuation:15.5 db
Downstream Transmit Power:12 db
Upstream Transmit Power:18 db
Now I know that I'm 6km from the exchange, but in the past I've been getting at least 2500kbps upstream!
It's a shame that I'm probably one of the 5% that will never get anything better in my lifetime...