Hi Isleyhawk,
I went up to the Mitchell after work today and good news, I managed to locate your grandparents. As my gran is in St Kentigerns Cemetery I started with that and there they both were!
Arthur Hart - Buried 1st Dec 1947 Age 79. Place of Death - 74 Chancellor St.
Reg No - 24789. Lair No 965. Section 13. Class C.
Margaret Harte (this is how it is spelt in the extract) -Buried 25th Oct 1949 Age 79. Place of Death - St Jos Home. Reg No - 24789. Lair No 965. Section 13. Class C.
As you can see the burial records are identical I haven't just mistyped.
Hope this helps.