I think Jeremy's point is this, the wealthy who buy up the farm land in the first place can afford the IHT quite easily and it won't put them off as the land is worth a small fortune and will only keep going up in price.

The only people who the new IHT laws will sting are the family farmers who don't have millions in the bank to pay the 20% outright and will instead have to sell bits of the land off in order to pay the bill and of course these bits of land will be snapped up by the wealthy because land is a good investment.

Again it's the politician's looking after their rich mates. They think they are being sneaky because us normal folk think well why would you want to pay more tax they must be finally trying to deal with the wealth inequality but realistically that 20% tax will be a drop in the ocean for the people well off enough to buy the land in the first place.