John Cooper-Clarke warned me off that rag a long time before I was interested in redtop newspapers. I mean, no Janie Jones!!!
But the "empirical evidence" seems to be flaky according to 'emerging' evidence. I too want to make the 'uber rich' pay what is due. Tax evasion should be punished. But passing on a working farm is not tax evasion. Farmers of medium sized farms, who WILL be affected mostly earn around £20-40k per annum. Now their heirs, who live and work on the farm already, and have likely won a degree in agriculture at university, will have to pay 20% tax on the estate. They won't be able to afford that, so they will have to sell some land off, which they will have to pay 40% CGT. So effectively 60% tax for their father/mother dying.
But that's OK by you, in your retirement house by the sea, reading the Guardian amongst the other rich townies who live in Portishead. You should come south a bit and speak to some real farmers in rural Somerset.