The average UK home broadband users downloads 17GB of data each month

"The average home broadband user downloads 17 gigabytes (GB) of data each month, equivalent to streaming 12 hours of high-definition content from the BBC's iPlayer, as data use has increased sevenfold over the past five years, says a new report.
At the same time 97% of UK premises – and 66% of the country – can get a voice signal outdoors from each of the mobile networks O2, Orange, T-Mobile and Vodafone, while 73% of premises and 13% of the country can access 3G data signals, according to research by the communications watchdog Ofcom."

Source:  Data from Ofcom, reported by The Guardian, 1st November 2011
Press release here
Full report here