Obit in the Telegraph of 21 Aug 2020:
EXTRACT
Sir John Guinness, civil servant who helped to push through energy privatisation – obituaryMargaret Thatcher rated him highly, while one energy company boss said he had ‘a mind like a chess-player’Sir John Guinness, who has died aged 84, was a scion of the brewing and banking family, but followed his own path as a civil servant and government adviser.
...John Ralph Sidney Guinness was born on December 23 1935, the second of two sons of Captain Edward Guinness, a partner in the family bank of Guinness Mahon, and his first wife Martha Letiere, née Sheldon.
...In 1967 he married Valerie North, of the North family of Rougham Hall, Norfolk. From 1997 until her death in 2014 they lived at East Barsham Manor, near Fakenham, a Grade I tour de force of Tudor brickwork built between 1520 and 1530.
He is survived by a son and daughter. Another son predeceased him.
Sir John Guinness, born December 23 1935, died July 27 2020 https://www.telegraph.co.uk/obituaries/2020/08/20/sir-john-guinness-civil-servant-helped-push-energy-privatisation/