Edo's great-grandfather Sir Robert Burrows and Beatrice's great-grandfather the Duke of York (later George VI) were friends. The Duke sometimes stayed with the Burrows family at their home, Bonis Hall:
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Edo's mother's family were (for the most part) upper middle class: company directors, merchants, and farmers. Nikki was raised in the Church of England but she comes from a long line of nonconformists (Baptists & Methodists) as well as Scottish Presbyterians.
In addition to Sir Robert Burrows KBE, Edo's maternal ancestors include:
(1) Emerson Muschamp Bainbridge, founder of Bainbridge's department store
https://en.wikipedia.org/wiki/Bainbridge's
(2) Charles Campbell, wealthy merchant in Melbourne, Australia
Biography - Charles Campbell - Australian Dictionary of Biography
(3) William Arnot, tea merchant in Glasgow, father of Frederick Stanley Arnot, missionary in Africa
https://en.wikipedia.org/wiki/Frederick_Stanley_Arnot
https://dacb.org/stories/democratic-republic-of-congo/arnot-stanley/
(4) Elizabeth Dawbarn, religious writer
https://en.wikipedia.org/wiki/Elizabeth_Dawbarn