Sorry if this is not news but I don't know how much you know about FTTC.
The C in FTTC is for cabinet and this is where your 'copper' terminates. This will be hopefully significantly nearer than your exchange where your current ADSL line goes.
This reduction in line length is why the speed is so much faster
If you know what cab you are connected to and approx. how far away it is you can estimate your speed which is what the online checkers are doing.
I am very near to the cab so get close to the max 80mb/20mb down/up.
Edited by smouty (Tue 21-Jan-14 14:45:24)