The following information is from the Government's statistics website, from the section covering Internet Access and website usage: -

Percentage of adult Internet users who used selected online activities in the three months before interview, 2006, GB
Looking for information and using email were the two most common online activities of Internet users in 2006. These were done by 85 per cent and 81 per cent of adult users respectively in the three months before interview in 2006.
Two in five (44 per cent) of the adult population said they had ever purchased something online for private or personal reasons other than work. The most common items bought by online shoppers in the 12 months before interview in 2006 were travel and holidays (51 per cent), followed by films, videos and DVDs (42 per cent). One in five (18 per cent) of Internet users had sold goods or services over the Internet: this was more than double the proportion (7 per cent) in 2003/04.
The majority (70 per cent) of those who had shopped online had not encountered any problems doing so. For those who had, the most common problem was that delivery took longer than expected; this was experienced by 14 per cent of online shoppers.
Source: Omnibus Survey, Office for National Statistics
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