The building that i dwell in, comprises of 1 other flat and a lock up shop, both the flat and shop get better results for both ADSL and FTTC , out of the 3 only i have a FTTC service that has obtained a above 80/20 attainable rate for over the past 12 mths,(300-350mtrs from cab) & 1.6-1.9km from exchange, the estimated adsl speed has always been way lower than what the line is capable of too, so the bt checker gives bs results imo