What a great idea. I wonder why no-one thought of it previously? And amazing they aren't paying anything already.
BTW, have you heard of the Laffer Curve?
For the very rich, paying taxes is pretty much optional. Tax them too much and they just rearrange their affairs so as not to pay it. Or they emigrate as they are doing, in droves. You cannot just keep squeezing them further and further and expect to generate more tax revenues.
I'm afraid what this country needs now is an increase to the basic rate of income tax, with an uplift in the personal allowance so that the people on the bottom end of the pay scale, are not subject to hardship.
But a 20% basic rate in this climate, is not enough to pay for the services we need. Average pay is £37k I discovered recently, so 2 parents both on average pay can earn £74k and only pay 20% tax on £50k of it (£74k minus 2x personal allowance if £12,500). It's not enough. I'm a big advocate of lower taxes but from where we are now, I see no other option.
(And I say this as someone who no longer pays the top rate, so any increase to that would suit me personally just fine. But it wouldn't help.)