ADSL2+ , up to 24Mbps, is already being brought in...
http://en.wikipedia.org/wiki/ITU_G.992.5#United_Kingdom

VDSL, up to 50Mbps, requires fibre optic cabling which BT has currently no plans to install. 28 German cities have this.

Cable. 50Mbps is to be offered by Virgin in 2008

FTTH, 'fibre to the home', has the fibre optic cable going straight to your house. It offers 100Mbps in both directions and is already used in Japan and Korea.