I think that OP's original request of when did Thomas & Rose die may have been solved but only death certificates would confirm.
Deaths Mar 1943
Rose E Grimes
age 74
Barnstaple 5b 532
because that is the area she was living 1939
Death, March 1928, Pontypool 11a 194
Grimes, Thomas
age 58
because the family had moved back to the area
1939 register will confirm Roses marital state, make sure you see the original as transcripts are often misleading
All we need now are the burials
