10 Downing Street: Prime Ministers in History
   Official UK government site provides profiles of all prime ministers since Robert Walpole in 1721, including portraits from the Government Art Collection.
   http://www.pm.gov.uk/output/page123.asp

Archontology: United Kingdom: Principal Ministers: 1730-2007
   Biographies extracted from Dermot Englefield, Janet Seaton and Isobel White, "Facts About the British Prime Ministers: A Compilation of Biographical and Historical Information" (1995). Each has a portrait or photograph.
   http://www.archontology.org/nations/uk/bpm/00_1730_prmin.php

Britannia.com: Britain's Prime Ministers
   Short biographies on every British Prime Minister from Walpole (1721) through the present.
   http://www.britannia.com/gov/primes/

Spartacus Educational: Prime Ministers 1715-1990
   Offers biographies of British Prime Ministers from Robert Walpole to Margaret Thatcher.
   http://www.spartacus.schoolnet.co.uk/pm.htm

The Hewett School: British Prime Ministers
   A list of Prime Ministers from 1721 to today; includes some biographies.
   http://www.hewett.norfolk.sch.uk/curric/POLIT/brit/prime1.htm