The TUC calculates that 3.3 million workers are under-employed in the UK (a figure which has increased by 42% since the 2008 economic crash). Under-employed describes those workers who are doing part-time jobs because full-time ones are not available or who want more hours in their current jobs. The Guardian reports today that 1.2 million people will be affected by loss of state benefits next year when the Universal Credit benefit payment is introduced unless they find an additional job or secure higher wages in their existing job!
http://www.guardian.co.uk/politics/2012/oct/04/million-working-adults-benefits-cuts
http://www.tuc.org.uk/economy/tuc-21363-f0.cfm