Mabel,
...and the midwife information that you have also unearthed should provide much more with a bit more delving into their records.
There is a letter somewhere in the family to "My Dear Lizzie", unfortunately with no date on it, but it is definitely written by her mother, who's discussing the writing of her will. So the letter may well have been written some time before 1920, much later than I had imagined. Though of course people do compose wills well before they in fact die, especially if they become quite unwell..
Many, many thanks again, for all this detective work!
Keith
