Skeptical this would make much difference. Pull the bell wire out of pin 3 on your main telephone socket.
Speed test on the BBC diagnostics page went from 1Mbps to 3.5Mbps. Pretty impressive increase given the distance from the exchange/not having cable etc etc.
The bell wire isn't necessary unless you are using an old analogue phone. It acts as an aerial and injects noise into your line - making your ADSL router see a poor signal-to-noise ratio.
Should have done this ages ago as I knew about it. Google it tis all over the web.