History of trade unions:
http://en.wikipedia.org/wiki/Trade_union
Also: http://www.unionhistory.info/timeline/timeline.php
General:
http://www.thesite.org/workandstudy/working/workersrights/tradeunions
Advantages/Disadvantages of:
http://www.economicshelp.org/2007/04/advantages-and-disadvantages-of-trades.html
Government advice:
http://www.direct.gov.uk/en/Employment/TradeUnions/index.htm
ATL (Association of Teachers and Lecturers):
http://www.atl.org.uk/
NUT (National Union of Teachers):
http://www.teachers.org.uk
Life without trade unions, eg. working in Dubai (Panorama programme - slumdogs and millionaires):
http://www.bbc.co.uk/programmes/b00jqgww
