If you want more bandwidth you can always bond 2 or more lines together, or get FTTP.

http://www.speedtest.net/result/2047620939.png

I am Fiber-to-the-Building. Imagine 40 metres to the cabinet

http://www.speedtest.bbmax.co.uk/results.php?t=13415...

http://www.pingtest.net/result/66140674.png

In reply to a post by Anonymous:

My estimate was 76.6 Meg Down and 20 Meg Up. I do not understand why they did not show a 100 Meg option to me as I am saying I am 40 metres from cabinet and I get 76 Meg at SNR 22.8 dB out of 138024 attainable?
SNR even changed to 9 dB (where on 3 dB with O2 was stable for weeks) should give me at least 120 meg but will not because it is caped. Is there no safe way of uploding another uncaped config file ?

As people have already said several times, VDSL is capped at the DSLAM not the modem. Only Openreach can lift that cap.

The reason the modem still claims a higher attainable rate is it can still see your line has spare capacity, even if the DSLAM will not allow it to use it.