When the ubiquitous Green party leader Zack Polanksi was on the BBC’s Sunday with Laura Kuenssberg s how singing the praises of wealth taxes last month, he said something that got my spider-sense tingling:

‘This isn’t about creating public investment, we can do that anyway, we don’t need to tax the wealthy to do that.’

On the face of it, this is a slightly odd thing to say. Other lefties, such as Richard Burgon MP, have argued that a wealth tax could be used to give more money to Our Precious NHS or remove the two child benefit cap. Polanksi is right to say that we can have more ‘public investment’ without a wealth tax – we can tax other things – but why he is so eager to divorce tax revenue from public spending? He must know that voters are more likely to support tax rises if the re

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