@JustTryingToBeMe nope nope only 19% of people are claiming UC and not working through "choice". These are typically people between work, or people who have been recently made redundant, these tend to be short term claimants. These people are less likely to have children and not take advantage of the scheme.
You have a large group of people working but being paid piss poor wages I would argue people who work in low wage jobs, work far harder than I as an average earner ever do.
The rest are too disabled, or caring for someone who is too disabled to work. The unpaid carers (a huge proportion of will be on UC) who save the economy £184 billion annually deserve a day at the zoo on the cheap IMO