I get quite angry when people say that £24k is the national average income. It isn't! It's the mean income and is skewed by people who earn considerably more than £24k. If ten people earn a total of £24k, but one person earns £100k, nine people earn around £15.5k.
What this means is that people say that they cope very well on much less than the national average, so everybody should be able to cope, so we have a situation of poverty denial.
Median income in the UK is around £18.5k. That means that half of the population has an income higher than £18.5 and half are below.
Below £18.5k there is still quite a wide range with some people having an earned income below £10k, which is a typical income for the self-employed.
Organisations such as the Joseph Rowntree Trust have rates for absolute poverty, which means not being able to afford basics such as heating, nutritious food, clothes, essential bills (water, council tax) communication (phone, internet), transport, etc The rates are divided into before and after housing costs.
There are approximately 4 million people in the UK who live in absolute poverty. No matter how they allocate their money, they don't have enough to make safe choices, so end up paying for heating and not food, etc. If there is more than one person in a household, a choice can be made to feed some of the people properly, but not others, which is why some single parents end up feeding and clothing their children relatively well, but not themselves.