Theoretically, if you are practically next door to the exchange you could sync at 24mbps.
In accordance with the new rules that Jim linked Plusnet can only advertise an up to speed that at least 10% of their users achieve.
If you put your attenuation in to
http://www.kitz.co.uk/adsl/max_speed_calc.php it will give you an estimate of what you might get.
jelv
Plusnet user since November 2001