Jalima May was being very clever when she mentioned JAMs, because so many people think that they are 'middle income' or JAMs. The facts tell a different story and many people think they're worse off compared to others than they actually are. I'm maybe assuming something here, but I guess you no longer have a mortgage or, at least, it's not so high as many younger people have.
The median salary in the UK is about £26,000. Net pay is obviously much lower and total income will depend on a number of factors, such receipt of tax credits or any other benefits or income from savings and payments such as pensions, NICs, income tax, student loan repayments, etc. As a result it's not possible to be accurate about net income. However, after housing costs it's reckoned to be about £23,000 per household and it depends on the calculation method.
Assuming that the above figure is accurate, there are even further variables, such as travel to work, etc. Most people round here pay about £5,000pa on commuting costs.
"Middle disposable income* is somewhere in the £20k region, so half of all households have income below that figure. The spread above £20k is very big. Having a disposable income of over £30k places a household in the top quartile, so my understanding of "middle income" is from about £16k to about £25k. I really doubt that the parents of most of my students have an income that low.
Anyway, I thought that the elderly denied being "well off". How come they can afford to pay for tuition, while their children can't?
I still don't see the point of this anyway, although it's a good argument against hypothecated tax, because people resort to "It's not fair - he's getting more than I do and doesn't deserve it" squabbles.