British Library - Newspapers, Magazines and Periodicals Collections

National archive collections in the United Kingdom of British and overseas
newspapers, including online facsimile issues of London's Daily News, The News
of the World and The Weekly Dispatch, and The Manchester Guardian.

http://www.bl.uk/collections/newspapers.html

Guardian Unlimited: Newsroom Archive

Newspaper museum for the Guardian and Observer newspapers. Site includes details
about the archives, education facilities for students and adults, special
exhibits and events. Online history and timelines.

http://www.guardian.co.uk/newsroom/