Sinclair in Cambridge - Very brief history of Sinclair in Cambridge, and of Cambridge University's Sinclair Building. - http://www.iankitching.me.uk/history/cam/sinclair.html
Planet Sinclair - Sir Clive Sinclair - Biography and chronology of Sir Clive's life (to 1986) plus various interviews. - http://www.nvg.org/sinclair/sinclair/sinclair.htm
Uncle Sinclair - Brief page on Sir Clive focusing on his calculators, though he also invented the digital watch, and was father of the British home computer revolution. - http://www.dotpoint.com/xnumber/sinclair_notes.htm