

So, you could do that on income or on wealth.
On income, the “rich fucks” could be defined as the top 1% of individuals with an income over £160k. Call the average income of someone in that bracket 200k, and tax them every penny they earn - that’s about £68 billion, which is net 40 billion once you subtract the tax they already pay. This is not a marginal rate of 100%, this is leaving them with no income. £40b is a decent but not massive amount, equivalent to 3% of the current budget.
That maximum shrinks from 40b to something like 20b once you decide on a marginal rate instead, and probably to something like 10b once behavioural change from those high earners trying to pay less tax.
So wealth then. The commonly touted version (I believe that’s 1% on everything anyone owns over £10m) is projected to earn 24bn a year, but then rapidly be avoided by people stashing their money elsewhere. A one off wealth tax might work much better, and would work well from the point of view of “wealth inequality has increased massively, we need a once in a generation rebalancing” but this would raise 160bn once only.
If we can optimistically raise £44bn per year for a while, that works out at £1500 per household, or £30 a week. That is not nothing - many households are desperate for that much. But that is not an amount that just fixes poverty for the entire country. It is not an amount that pays for every school with RAAC to be renovated, or every GP surgery to have enough appointments, or every town to have a bus service that isn’t shit.
This doesn’t mean it shouldn’t be done. The country does not tax the rich enough, and fixing that will help equality. But it will not turn the country around. It will also have knock on effects that make its practical efficacy even less.

That’s great, but 18% out of poverty is not fixing an entire country. If labour had such results, Reform supporters would still be blaming the remaining 72% on immigrants.