I am totally unrelated but stumbled across a query regarding Isabella with such an unusual name it intrigued me, especially as the last known address is London.
What do you make of this entry found in www.familysearch.org - how many Isabella Ballentyne Airds could there be?
Death Date: 08 Jul 1986 Death Place: Vancouver, British Columbia, Canada Name: Amy Bella Lay Gender: Female Age: 72y Birth Date: 08 Mar 1914 Birthplace: Fort George, British Columbia Marital Status: Widow Spouse: Gordon Vincent Lay Father: John Albert Beacham Mother: Isabella Ballantyne Aird
Interestingly there is no trace of the marriage of John Beacham and Isabella Aird that I can see, however I did find Johns death which stated he was born in England! below
Death Date: 28 Jan 1983 Death Place: Prince George, British Columbia, Canada Name: John Albert Beacham Gender: Male Age: 101y Birth Date: 14 Jul 1881 Birthplace: , England Marital Status: Widowed Spouse: Isabelle Aird