It may have only been one documentary but I also recall the Panorama investigation when people were stopped outside of the benefits office and asked if they would like a job which paid above minimum wage and said yes and then declined as soon as they knew that it was picking veg. Said it was to much hard work. Or job seekers being given a chance to work in processing plants but either did not show up or quit after one day. Mind you there may have been other issues (health/ mental etc) that did not come across in the tv program (or were purposely edited out).

Not saying that living on benefits is fun but there is definately a population of people who prefer to do this than work.