William Johnston Keswick was a descendant of the Scottish Keswick bloodline. The Keswick bloodline are a smaller banking, trading and insurance family who made their fortune in Hongkong and Shanghai.

William Johnston Keswick was a director of the Bank of England. He was also a Vice-Chairman of Alliance Assurance, and a Director of the Anglo-Persian Oil Company (later renamed BP). From 1952 to 1965, he was Governor of the Hudson's Bay Company.

William Johnston Keswick. Bank of England. Report for the year ended 28th February 1970 at bankofengland.co.uk:
https://www.bankofengland.co.uk/-/media/boe/files/annual-report/1970/boe-1970.pdf

“Court of Directors
28th February 1970

Jasper Quintus HoJi om, Esq.
William Johnston Keswick, Esq.
Sir John Maurice Laing”

https://en.wikipedia.org/wiki/Keswick_family
https://en.wikipedia.org/wiki/Tony_Keswick