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British History Online
British History Online is the digital library containing some of the core printed primary and secondary sources for the medieval and modern history of the British Isles. Created by the Institute of Historical Research and the History of Parliament Trust, we aim to support academic and personal users around the world in their learning, teaching and research." Syas it all, really.
Has quite a bit of modern information (which isn't too bad though suffers from the usual brevity and superficiality which afflicts internet secondary sources) and some primary documents if you follow the links.