I have run through what we would get if both my husband and I lost our jobs and spent all our savings and it would not be enough to live on, we would have to sell our house as we could not cover the mortgage. However if we were renting then we could rent somewhere OK with how much that old pay out and with either cutting back on almost everything, or doing some hours on minimum wage we would be able to have a surplus every month.
The thing is I also accept that we are in a position where we don't need many expensive items, we have a fully furnished home, no debts, nothing on finance and everything works, that does make it much easier to live frugally. If I want to cook cheap meals in a slow cooker I already have one, I have everything I need to bake. We also don't drink when it is just the two of us, don't smoke and there is no way I would pay for Sky.
What you often see is a vicious cycle though, my husband used to help out in Citizen's Advice and another local charity and very often the people really struggling has made a few bad choices and it had spiralled from there. Something breaks, their washing machine for example, and they panic and buy one on finance. You or I would go to John Lewis and buy one outright for £350-500, or have access to interest free credit, thir only option is buying on credit ar 30% interest or more, or from somewhere like Brighthouse where the product is sold for 2-4 times what it costs in John Lewis. Or they borrow using their overdraft or credit cards and again that is expensive.
The other issue is smoking and drinking, people in deprived areas are 4.6 times more likely to smoke than those who don't, people who rent are 3.5 times more likely to smoke, smoking is very expensive. Whilst the more people earn the more they tend to spend on alcohol they generally do this by drinking less alcohol, but more expensive alcohol, they can also easily afford this, those on low incomes cannot.
Finally lot of lower income households have Sky/Virgin on expensive packages, paying £50-90 a month for TV is hugely crippling to a tight budget. That combined with expensive phone contracts (£50-100 per phone) can swallow up huge amounts.
Benefits are very low for some, especially the disabled, and we have the worst pensions in the EU, but we also have very low taxes. We also have more working age people in receipt of benefits than any other country in the EU and the huge market distortions that causes.