Hi John
About halfway down the page on the following link, there is an interesting autobiographical note and, further down, info re: Monica's SIL and niece, also authors. Her SIL was Ursula Marguerite Dorothea Orange 1909-1955, who married Dennis Hamilton Tindall 1934 Marylebone 1A 1727.
http://tinyurl.com/Mrs-Prioleau-Tindall-Family'Footprints in Paris' by Gillian Tindall, Monica's niece, relates some of the family's history. A few pages are available to view at
http://tinyurl.com/hn6kgvm Following on from the research above, free searches on ScotlandsPeople gives a 1935 marriage RD St Giles for Monica McClean Tindall to an Edward Brian M Campbell and, matching 1999 death entries in RD Dalry (Dumfries and Galloway) for Monica McClean Campbell and Tindall, aged 92, MMN Jacob, which is confirmed on the new GRO index for Monica's 1907 birth.
Her husband was probably Edward Brian Moore Campbell born 1910 Whitehaven MMN Calder, whose parents were Robert William Campbell and Clara Louise Calder. Their marriage of 21 Jun 1893 can be found at
https://civilrecords.irishgenealogy.ie/churchrecords/details-civil/cec0d87556002The family are in Cleator in 1901
https://familysearch.org/ark:/61903/1:1:XSVL-SRQThere is a reference obit for Edward in 1993 on the following link, but I haven't located a death record.
http://www.ox.ac.uk/gazette/9394/030294/all.txt