The Arthurian Encyclopedia (Ref. DA 152.5 .A7 A78 1986)
The New Arthurian Encyclopedia (Ref. DA 152.5 .A7 N48 1991)
The Blackwell Encyclopedia of Anglo-Saxon England (Ref. DA 152 .B58 1999)
Medieval England: An Encyclopedia (Ref. DA 129 .M43 1998)
Tudor England: An Encyclopedia (Ref. DA 315 .T753 2001)
Britain in the Hanoverian Age, 1714-1837: An Encyclopedia (Ref. DA 480 .B75 1997)
Encyclopedia of Romanticism: Culture in Britain, 1780s-1830s (Ref. DA 529 .E53 1992)
The Encyclopedia of the Victorian World (Ref. DA 550 .E53 1996)
Victorian Britain: An Encyclopedia (Ref. DA 550 .V53 1988)
Twentieth Century Britain: An Encyclopedia (Ref. DA 566 .T835 1995)
The 1890s: An Encyclopedia of British Literature, Art and Culture (Ref. DA 560 .A18 1993)
The Hutchinson Illustrated Encyclopedia of British History (Ref. DA 34 .H88 1999)
The Oxford Companion to British History (Ref. DA 34 .O93 2002)
The Oxford Companion to Twentieth-Century British Politics (Ref. DA 566.7 .O88 2002)
The Columbia Companion to British History (Ref. DA 34 .H64 1997)
Encyclopedia of Contemporary British Culture. (Ref. DA 589.4 .E53 1999)
Europe, 1450-1789. (Ref. D 209 .E97 2004) This is a multi-volume set; a good place to explore a topic.
Reader's Guide to British History. (also available in print, Ref. DA 34 .R43 2003)
Historical Dictionary of the United Kingdom (Ref. DA 34 .P36 1997 - 2 vols.)
The Illustrated Dictionary of British History (Ref. DA 34. I44)
A New Dictionary of British History (Ref. DA .S7 1964)
Historical Dictionary of the Elizabethan World (Ref. DA 357 .W34 1999)
Historical Dictionary of Stuart England, 1603-1689 (Ref. DA 375 .H57 1996)
(Companions cover a specific period and provide a variety of information, such as occupants of courts, chronologies--handy facts.) These companions are all published by Longman's.
Longman Companion to...
The Tudor Age (Ref. DA 315 .O33 1995)
The Stuart Age (Ref. DA 375 .W76 1997)
Britain in the Eighteenth Century (Ref. DA .G74 2000)
Britain in the Nineteenth Century (Ref. DA 530 .C8 1999)
Britain in the Era of the Two World Wars, 1914-1945 (Ref. DA 566.T54 1994)
Britain since 1945 (Ref. DA 592 .C628 2000)
The following book isn't a COMPANION and not published by LONGMAN'S, but it is similar:
English Historical Facts, 1485-1603 (Ref. DA 315 .P68 1977)
An additional companion:
There are two Handbooks, also published by Longman's. They are similar to Companions but have more statistical information.
The Longman Handbook of Modern British History (Ref. DA 470 .C65 1988)
The Longman Handbook of Modern British History (Ref. DA 470 .C65 1996)
The following books consider about 300+ men and women for each period.
Lives of the Tudor Age, 1485-1603 (Ref. DA 317 .H65)
Lives of the Stuart Age, 1603-1714 (Ref. DA 377 .L35 1976)
Lives of the Georgian Age, 1714-1837 (Ref. DA 483 .A1 L35 1978)
British Political Leaders (Ref. DA 28.4 .B65 2001)
Covers 198 political leaders from 1730-current.
Biographical Dictionary of British Prime Ministers (also, Ref. DA 28.4 .B56 1998)
Coverage is from Walpole to Blair.
The Mammoth Book of British Kings & Queens (Ref. DA 28.1 .A85 1998)
Coverage is from pre-Roman times to present.
Queen Victoria: A Biographical Companion (Ref. DA 554 .R37 2003)
Covers persons, places, and events surrounding the life of Victoria.
Dictionary of National Biography (Ref. DA 28 .D47, 22 vols.)
Authoritative articles on British people.
Who's Who in History (Ref. DA 28 .W 618)
Five volumes in length, covers the period 55 BC-1837.
Who's Who (Ref. DA 28 .W6 1900-2010)
Who Was Who (Ref. DA 28 .W65)
Facts about the British Prime Ministers (Ref. DA 28.4 .E54 1995)
Coverage is from Walpole-John Major.
The Kings and Queens of Britain (Ref. DA 28.1 .C36 2009)
Victoria Research Web
Covers archives, libraries, bibliographies and discussion groups.
Victorian Studies on the Web
Covers recent books, articles and announcements.
The Victorian Web
Covers all areas of knowledge, such as religion, science, technology, philosophy and history. Many links to original sources.
Specializes about everyday life in Britain from 1937- early 1950's.
Discussion forum for British and Irish history.
Historical Text Archive
Not really historical texts but a collection of almost 300 sites on many topics.
Britain's Age of Empire Index
This is good for biography, including prime ministers, church history, original texts and sources, to name a few.
Victorian Women Writers Project
Includes transcriptions of women writers of the nineteenth century.