I think if you look closely at the 1881 census for John Emmet Iggo his middle name IS Emmet not Ernest.
In 1891 John was working as a house painter and living with his wife (Ann Jane Iggo, nee Lamb) at 12 Worcester Street, Gateshead. He and his wife were still at this residence at the time of the 1901 census, but their ages were noted incorrectly.
John predeceased his wife of 33 years dying at age 67 in Gateshead. Ann died at age 78 in 1924 in Gateshead.
Hope this helps.
In the meantime if anyone knows what happened to Ann Iggo after 1881 I would appreciate the information. Ann had married Lancelot Johnson in 1868 in 1868 in Newcastle. I have found the couple with older daughter (Margaret Jane Johnson) on 1871 census in Newcastle. I believe Margaret died later in 1871. I have found Ann with 4 children (Joseph, George, Mary Anne and Anne) on 1881 census in Newcastle.