This looks like them on the electoral rolls:
Alexander Wilson Grant and Ellen Grant 1937 and 1938 at 242 Belle Grove Road, Bexley, Kent
Yoo asked me by pm how to learn more about AWG's death. You would need to get a copy of the death certificate. The cheapest way would be to buy a pdf copy from here:
https://www.gro.gov.uk/gro/
You also said something about a second marriage?