The site of the Institute of Historical Research provides searchable history material including books, articles and theses.
British History Online
A digital library of key printed primary and secondary sources for the history of Britain and Ireland, with a primary focus on the period between 1300 and 1800.
Western Front Association
Contains a wealth of articles on The Great War.
Royal United Services Institution
An independent think tank engaged in cutting edge defence and security research.
The websites of all government departments and many other agencies and public bodies have been merged into GOV.UK.
Webpage of the UK Parliament, giving details of how it works, progress of bills etc.