According to the British Library, 10 per cent of .uk web pages vanish or are replaced by new material every six months.
At the launch in London, British Library's chief executive Dame Lynne Brindley said that the library has worked with copyright holders to capture and preserve over 6,000 select websites.
"A failure to record and preserve the UK domain would not just be detrimental to future research but leave a significant gap in our digital heritage," said Margaret Hodge, the UK's Minister of Culture and Tourism.
The library will not be able to record more than 1 per cent of online content by 2010 because of copyright restrictions. The UK currently has 8 million websites.