As part of the Digital Economy Act 2010, Ofcom has a duty to report on the state of the UK's telecoms infrastructure every three years. Consequently it has now published the UK Communications Infrastructure Report 2011 that reports on fixed line and mobile telephony and broadband, digital radio and digital terrestrial TV. It reports that the average home with broadband downloads over 15GB of data per month - that's over 10 hours of video.
For more details on the state of UK broadband, go to Ofcom's Broadband Speed Report 2011. They have also produced an interactive map, at UK Fixed Broadband Map 2011.