Thanks for your input Alan,
So, it looks like there is going to be no further information from the newspaper entries.
Yes, hat is the 1871 census I have attached to Owen's wife Bridget. She appears with her husband on the 1851 and 1861 censuses prior to that.
In 1851 living at Back Terrace. Surname Mackmann. Owen was working as a Railway Labourer. Also living there are sons James and John and Hugh Wood along with several other lodgers and visitors. I deduced Bridget was nee Woods as her son John, born 1849, has a mother with maiden name Wood on the GRO Birth Index. He died shortly after the census.
In 1861, they were living at Malcolm's Yard. Owen is recorded as a Labourer. Also living there was son John aged 20, servant Mary A Wood and boarders Peter Woods and Peter Warren.
I worked out that Hugh Wood and Mary A Wood are the children of John Wood and Mary McNally. I have John Wood hypothetically as a brother of Bridget. They were living at North Terrace, Seaham Harbour in 1851 and John was also working as a Railway Labourer. They had children Rose, Margaret, Bernard, Hugh and Mary Ann. According to online trees, John Wood died in Durham about 1860, but I can't find any evidence of this and his wife took Bernard and Hugh to Pennsylvania, arriving in New York in 1865. Rose was already there, arriving 1863. Not sure about Margaret but her daughter was born there in 1869. Mary Ann ends up there but I don't know when.
I am wondering if Bridget went there herself and the death I have for her in 1882 is another Bridget.
Until recently, I had her on the 1861 census at another address, Back Rail Street, living with son John, his wife Sarah and his son John. So, if you put a search in for James McMann in that census, 3 come up, all living in Seaham Harbour. But, what I didn't realise, is that the Bridget on the one living at Back Rail Street was 10 years older than my Bridget so I think the death is more likely to be her.
Looks like I've hit a brick wall.