Thank you Annette for sorting out the Mary CUNNISON story. It's interesting how small errors in reading documents can lead astray. Mary died of tuberculosis 12 October 1898 at Pirries Court, Canongate, Edinburgh; the document mentions her husband William BROOKS, his occupation house strapper (I've checked around without a result -what is a house strapper?).
As Annette surmises in a previous message, William LOWE bc 1873 Great Malvern was the son of Eliza Ann THOMAS and her first husband, William LOWE. Eliza Ann then took up with William BROOKS and had two children: George Frederick BROOKS (from his birth certificate born 12 Sep 1877, parents William BROOKS and wife Elizabeth [formerly LOWE]) and Albert Edward BROOKS (b 1879 Weedon Bec, Daventry). I have searched for a marriage of William to Eliza and variants, with and without the surnames Thomas and Lowe but no success.
The William BROOKS who died a widower warehouseman of tuberculosis 24 April 1912 at Longmore Hospital is the one that I am interested in and seems to be the one who married Mary CUNNISON in that the informant of his death, his son William BROOKS, was of 4 Pirries Close, which is the 1901 address of Mary CUNNISON's parents and children (William was in Longmore at the time). In the death entry, his parents were William and Sarah BROOKS, which contradicts his parents' details in the marriage to Mary CUNNISON. In 1901 William BROOKS was in Longmore Hospital (formerly a stableman) and in 1891 he was at Pirries Court with Mary and children. No sign of a William BROOK[E]S born 1851 elsewhere. From the 1881 census, no sign of him in Scotland despite the marriage in 1875 but you can see that the William BROOKS ('marr', with Elizabeth BROOKS, 'marr') in Titchfield was born in 'Warldon' -which I take to be Walden, Saffron Walden. I can't find him in the 1871 census; if anybody can find him, I'd be grateful.
The only William born in the early 1850s who fits the bill for the William who died in Edinburgh is the same as the William who was in Titchfield in 1881 -born 28 October 1851 in Castle Street, Saffron Walden, parents William BROOKS and his wife Sarah (nee SMITH).
Given William BROOKS the rockwork artist's wanderlust, for the moment I am attributing the the groom's parents' details in the Cunnison marriage and the fact that he had two sons by Eliza (and featured in the 1881 census with her) after his marriage to Mary CUNNISON only as difficulties for matching the William who died in Longmore Hospital, Edinburgh with the William father of George Frederick and Albert Edward BROOKS in England.
I'd still like to know what became of the familes of William and of George BROOKS but finding more evidence for or against these two Brooks in Scotland being father and son has now become more important.