Another little list:
Neville Chamberlain: Wealth at death
£84,013 6s.: probate, 15 April 1941
Baldwin, Stanley: Wealth at death
£280,971 3s. 1d.: probate, 18 March 1947
Winston Churchill: Wealth at death
£304,044: probate, 9 Feb 1965,
Harold Macmillan Wealth at death
£51,114: probate, 1 June 1987
Yeah, I believe MacMillan only had £51K - the British aristocracy and their trusts, eh? I wonder how only 1 in 20 people pay inheritance tax? hmmm.
Anyway, look at it how you will, the figures aren't too far different, though Saint Attlee still shines through.