Thanks SS - I have actually managed to use the different resources that you have referenced to find out that four other family members emigrated to Australia.
I have not been able to find the record of Marjorie's death. I am looking for Marjorie CALLEAR then TAYLOR on victoria bmd records. 
Victoria BMD has restrictions to recognise sensitivity of personal information
https://www.bdm.vic.gov.au/search-your-family-history restrictions for
Birth
100 years after date of birth
Death
30 years after date of death - (
reply 9 death
3 Nov 2009 Victoria)
Marriage
60 years after the date
That explains why I couldn't find her death registration either on Victoria BMD, her husbands death entry is listed 1976 (
49 years) and their 1958 marriage is listed (
67 years)
If he’s not mentioned on the Will, a long shot might it be worth getting their m/c
just in case he is a witness EDIT oops forget that he wouldn’t be old enough
