CrashDive. 0808 993 300
6?
Possibly a typo but, if not, try 0808 993 3001.
But aisleman and others point to the heart of the matter. And I think distance from the exchange is a major factor - particularly with Home Highway. HH is, for my personal circumstances, absolutely ideal. So much so that I am quite glad that BT have fallen behind with their ADSL program in my area and I don't have to make the decision about whether to change yet. I get a 64K link every time and at the moment the service is back to the previous high standard. But it sure can vary...
Home Highway and ADSL are incompatible at the moment, I'm told by my local BT gurus.