It's curious that the percentages used to defend not taxing the rich (whether they are UK citizens, or operating as "non-doms") tend to be what percentage of the tax burden they pay. But it's never what percentage of their income and capital gains they pay as tax.
I think the latter is a fairer representation, considering we have a progressive taxation system. Someone who is earning over £125k a year should be paying close to 45% of their income and capital gains.
The question is: are they? If not, why not?