Obit in the Times of 29 May 2021 (which usefully gives details of his marriage in 2014, not previously recorded in Debrett):
EXTRACT
OBITUARY
Julian Gibbs obituary
Financial adviser, investment columnist and dedicated bon viveur who went bankrupt twice
...Julian Gibbs, a scion of an established banking family, was a long-time investment columnist and a founding member of Money Marketing. He was also a former whisky and lavatory brush salesman in Africa, a bon viveur whose lavish parties were lit up by bright young men, and a man so impetuously generous that he once bought one of David Frost’s companies to help a friend who depended on its income. He made a lot of money in the City but was insouciant of details and careless of his own financial advice. Twice declared bankrupt, he bounced back each time.
Gibbs came from a family long at the centre of British finance, politics and diplomacy. One uncle was chairman of NatWest bank. Another, Sir Humphrey Gibbs, was the last governor-general of Rhodesia before the unilateral declaration of independence. A brother was a noted antiques dealer, chairman of the J Paul Getty charitable trust and a fashionable dandy who was the first man, reputedly, to wear flared trousers. His father, Sir Geoffrey Gibbs, was a philanthropist and the first chairman of the Nuffield Foundation, while his mother, Helen Leslie, was chief commissioner for the overseas Girl Guides.
The first in his family to make a financial splash was his great-great-great-great grandfather, who made a fortune from digging up and selling guano...
Julian Herbert Gibbs was born in 1932 in Essendon, Hertfordshire, and raised in comfort at Maidwell Hall in Northamptonshire.... he worked as an underwriter for the family firm Antony Gibbs, but, he reminisced later, “as the third son of the second son of the fourth son, I was quite a small cog”. ...
...In the late 1990s he found a permanent partner, Joel O’Connor, and both made much of their zest for life. They were married in 2014. Joel survives him....Julian Gibbs, financial adviser, was born on November 20, 1932. He died of organ failure on April 25, 2021, aged 88
https://www.thetimes.co.uk/article/julian-gibbs-obituary-jwr9hgmsn