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As you are interested in the shipping connection, you may like to know about this death notice, if you have not already seen it:
The Brisbane Courier Friday 24 January 1890 page 4
http://nla.gov.au/nla.news-article3509282DEATHS.
DOWNIE.- On the 23rd January, at High-street, Toowong, suddenly, of heart disease. James Downie, tailor and shipowner, late of Newbiggln by the Sea, Northumberland, England, aged 71 years, [Home papers please copy.]
The descendants of John Downie and Mary Lisle seem to have mostly been tailors in Newbiggin and nearby towns but to have then branched out into owning ships. I'm reasonably confident (without having found his birth) that this James was the son of John and Mary's son George Downie and his wife Maria, and that he married Sarah Isabella Robson on 28 May 1864 at St Paul, Elswick. George has a similar occupation to James in the 1861 Census but in the two earlier ones his occupation is Tailor (all in Newbiggin).
I have nothing at all after the 1881 Census, when the James who was the husband of Sarah Isabella Robson was listed as a Clothier Tailor. It may be possibly to obtain his death certificate from Queensland - Australian certificates I have seen have shown parents' names like those from Scotland (plus even more information) but these were from other states.
Ian