The British Library Newspaper Library at Colindale houses the national archive collection in the United Kingdom of British and overseas newspapers - "the only large, integrated, national newspaper service in the world, combining facilities for the collection, preservation, and use of newspapers all on one site".
Newsplan - a co-operative programme for the microfilming and preservation of local newspapers and for making them accessible to users; provides links to regional Newsplan projects, a number of which have already produced extensive online catalogues.
The London, Edinburgh, and Belfast Gazettes are the official newspapers of record in the United Kingdom. As well as the current editions, the website includes searchable archives of the complete gazettes from WW1 and WW2 containing medal awards, army and navy commissions, promotions and much more.
Historical Newspapers - a (subscription) service incorporating The Official Index to The Times, Palmer's Index to the Times, The Historical Index to The New York Times, and Palmer's Full Text Online, 1785-1870.
The Nineteenth-Century Serials Edition (ncse) is a free, online edition of six nineteenth-century periodicals and newspapers: The Monthly Repository and Unitarian Chronicle, The Northern Star, The Leader, The English Woman's Journal, The Tomahawk, and The Publishers' Circular.