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/