I think he's an odious man and the full force of the law should be thrown at him, but I don't understand why Royal Lodge is such an issue.
He doesn't get any taxpayer funding and has apparently paid £1m up front plus £7.5m in renovations required by the lease, so he's hardly living there rent free (as is often reported).
It's unfair that so much wealth sits with so few, and that they so often turn out to be awful, but as it stands he does have (inherited?) money and has paid to live in the house. Or is the going rate for such a property more than £8.5m rent?