Brother, can you spare a billion?
Just a quick list:
MacDonald Wealth at death
£21,501 18s. 5d.: confirmation, 12 March 1938
Attlee Wealth at death
£7295: probate, 4 Jan 1968
Wilson Wealth at death
£490,992: probate, 17 Oct 1995
Callaghan died to recently for me to find him, but the list, I think, makes the point. MacDonald was directly corrupted (being loaned a Roller, being taken to country houses, etc.) and yet he died with a relatively modest estate for a former Prime Minister. Attlee must have worn hair shirts all his life, or something.
Tony Blair has made £5 million (alleged) from his memoirs, and its gettign Millions of Dollars per year for consultancies with multinational firms such as Zurich and JP Morgan.
The genius of this is that in capitalist terms it is't corruption, not quid pro quo payments for services rendered. It is indirect corruption, the implicit statement that any Prime Minister will find a place in the trough, if they keep their nose suitably clean first.
The vast inequality in wealth and access to wealth implicitly corrupts the entire political system. There is no way of fixing this, only social equality can deliver genuine democracy.