I have found a theory (unproven without the death register entry) for the Death of Hannah HUNT (nee Nattrass)
As per this is long (I could never be accused of being brief)
Daughter of William Hunt and Hannah
with her family on 1841 and 1851 census
1841 census P313/bk15/f24/p42 Wingate, Co Durham P313/Bk14/F24/p42
Mary age 8 (not born in county)
1851 census P2392/353/27
Mary, age 18, born Heworth (which IS in Co Durham)
She's not with her family in the 1861 census
1854 FreeBMD Marriages
Has a John HUTCHISON (note not Hutchinson) and a Mary Ann Hunt Q1 1854 Sunderland 10a 423
Marriage Locator does not return a church venue for this vol and page no so I assume it was a Registrar's Office marriage
Sunderland Registrars site index search has the same marriage ref CO19Bk7/453
1861 census P3746/F39/30 Haswell
John HutchiNson age 33 born Houghton le Spring
wife Mary age 27 born Gateshead (Heworth was in Gateshead Civil reg District)
son William age 3 born Easington -Check GRO births - William Hutchinson, Q1 1858 Easington 10a 64, mmn HUNT
1871 census P4970/F70/p70
Dad, Mam and William all match the details in the 1861 census
and the new additions are
Jane age 9, born Haswell - check GRO births -Jane Ann Hutchinson Q3 Easington 10a 319 mmn HUNT
Mary E, age 2 born Haswell - check GRO births Mary Ellen Hutchinson Q1 Easington 10a 399 mmn HUNT
1879 GRO Deaths Mary Hannah HUNT Q4 Sunderland 10a 307, age 74
Though there is an additional forename
I can't find a death for a plain 'Hannah' Hunt in the right time frame so maybe her birth forenames were Mary Hannah and she was known as Hannah - its a possibility to consider in the absence of any other possibles
1879 St Paul, Ryhope Burials (transcript only, I don't have an image)
18 Nov 1879 Mary Hannah Hunt of 13 Bell St, age 74
age checks out and given the 1881 census for her daughter and son in law below this looks likely
1881 census P4999/F6/p5 13 Bell St Ryhope Hutchinson Household
Though only initials for forenames are used this matches with the 1871 census for the Hutchinson family
Check through this carefully, but it 'feels' right to me.
Can't document feelings though, so the £3 digital image of Mary Hannah's death register would be the only way to confirm it, fingers crossed the informant is a known relative .
Boo