Seems to be a speed doubling trial going on in Cardiff atm. Loads of people on Cableforum and the Virgin forum reporting they've been bumped from 50mb to 100 and 100mb to 200mb. Hopefully means the new 100/200/300mb tiers aren't too far off.
DOCSIS 3.1 for GB speeds is getting closer too http://www.broadcom.com/press/release.php?id=s889754
DOCSIS 3.1 for GB speeds is getting closer too http://www.broadcom.com/press/release.php?id=s889754