Well following on from 100mb apparently their trying out VDSL2.
more here
http://www.adslguide.org/newsarchive.asp?item=2557
This trial looks like it may be in the Guildford area, and may produce upstream speeds of up to 25Mbps upstream and 50Mbps downstream.
more here
http://www.adslguide.org/newsarchive.asp?item=2557