http://www.bbc.co.uk/news/business-23573442
"Figures from the Office for National Statistics (ONS), based on a survey of workers, found 583,000 people were on zero-hours contracts. That represents about 2% of the UK workforce." (April 2014)
~2% of the workforce are employed on zero hours contracts. For many of these people, it is an arrangement which suits them very well. This 'issue' seems to get more attention than it deserves. Perhaps because it suits the Red Ed agenda?