The BBC has a short article looking at studies from uSwitch & Forrester Research

The uSwitch study says the Online shopping in the UK is due to hit £40bn this year. It predicts that the UK’s online spending will further rise to £162bn by 2020, when it will make up 40% of total retail sales.

While Forrester Research predicts that online Christmas shopping will reach £13.8bn this year, a 42% increase on 2006.