General links
http://www.custominsight.com/articles/random-sampling.asp

Random numbers
http://random.mat.sbg.ac.at/

Research Methods in Real Life 'How complete is a census?'

http://www.statistics.gov.uk/census2001

Research Methods in Real Life 'Opinions about opinions'
www.math.uah.edu/stat/data/1948Election.html
www.ipsos-mori.com/researchpublications/researcharchive/103/Voting-Intention-in-Great-Britain-1976present.aspx
www.guardian.co.uk/news/datablog/2009/oct/21/icm-poll-data-labour-conservatives
http://yougov.co.uk/news/categories/politics