United Kingdom Resources and Information

• Book: Gary Boyd Roberts's The Royal Descents of 600 Immigrants to the American Colonies (2008) - lists all the gateway ancestors to British North America with their closest royal descent. Each line gives names, no dates, but is fully referenced for further research.
  
• Tim Powys-Libbe's medieval work  
• Chris Phillips's.Medieval English Genealogy website
  
• Plantagenet Ancestry (2004) by Douglas Richardson
• Magna Carta Ancestry (2005) by Douglas Richardson
• The ancestry of the Prince of Wales was published in two volumes by Gerald Paget in 1977. Because his maternal grandmother was primarily British, Prince Charles's ancestry yields many overlaps to colonial immigrants and provides their entire ancestry, not just lines back to royals and nobles. 
• Thompson and Charles Hansen's ongoing study of the ancestry of King Charles II of England, which has been serialized in the journal, The Genealogist, and is presently back to ancestor #2031
• Two more works will yield additional information in forthcoming publications: the ancestry of the late Princess of Wales for twelve generations was published in 2007 by Richard K. Evans, and in its next volume will be devoted exclusively to medieval times. 
• Leo van der Pas's Genealogics website gives many medieval lines, all of which are well-documented, although too much emphasis is given to 19th century works such as the Complete Peerage and Europaischer Stammtafeln.  
• Foundation for Medieval Genealogy 
• soc.genealogy.medieval USNET
  
• http://paleo.anglo-norman.org/medfram.html or http://www.nationalarchives.gov.uk/palaeography/default.htm from the British National Archives. 
• British National Archives, and many other depositories, are making their holdings available online either fully (such as the Prerogative Court of Canterbury Wills) or as indexes to materials.