Tories, practicing neoliberalism, have starved many vital state activities. Adding up the shortfalls suggests that around 70 billion UKP per year would be needed to fix things up in a reasonable time.

That doesn't count the cost of decarbonizing. Dependence on fossil fuels was not introduced since Thatcher by Tories, since it already existed, but Britain must nonetheless do its share to fix that.

The easy and natural way to get this money is by taxing the rich. Easy, that is, if the rich can't prevent the state from trying. Any other way would cause real difficulties.