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Re: where is James and Beatrice Birch
It would help your search if you obtained the death certificates for the couple to see where they actually lived when they died. If the couple were born in the Plymouth area then it's worth checking the Parish Churchyard where other family members were buried. People were still being buried in some Churchyards at this period, sometimes in family plots.
You could also check local newspapers for death announcements. Some are available on Findmypast and British Library Newspaper Archive.