Deaths Mar 1943
Rose E Grimes
age 74
Barnstaple 5b 532
That looks the right one. Full name Rose Ellen Grimes
Free search of the 39 Register has Rose E Grimes, born 1868, living in Barnstaple M.B., Devon
Putting Rose into "Other household member's" for Barnstaple brings up John W H Matthews, and May G Matthews, both born 1911
Birth, March qtr 1912, Dursley 6a 479
Grimes, May Gladys
mother Davis
May married Mr Matthews in Barnstaple in 1935
Not sure about the 1955 death for Thomas though.
In 1891 they were in Trevethin, Monmouth (Pontypool district). Could they have gone back to that area?
Death, March 1928, Pontypool 11a 194
Grimes, Thomas
age 58