This is a very good point, even if his estate paid full IHT, they would still be incredibly rich.
But as i learnt a long time ago, the more wealth one acquires, the more you want.
I'm with Octopus energy, Greg Jackson is now heading towards being a billionaire, i mean why? just think what good he could do for others with just a fraction of that money and if he can make that sort of profit, why have energy bills gone up?
Hoarding money seems to be a disease for some.