A footnote to the presentation: In the slide below, I thought the family that Margaret was posing with were the Lloyds.
After further inquiries, we thought it might be Charles Little and his wife Rosalind (aka Ruth). Charles was Margaret's first cousin. But that seems to have been proved incorrect. So we really don't know yet who is in the photo with Margaret. [Pity we don't always identify the people in photographs at the time the photos were taken!]