In the 1881 census Henry Turner is described as "Senior examiner in the Exchequer Dept and novelist". I have him in 1861 described as clerk and in 1871 described as senior examiner in the audit department of the exchequer. However I have found nothing about his career as a novelist.
A brief background. Henry was born in Salford or Manchester, depending which census you believe, in 1829/1830, parents probably William Turner and Mary Alsey. In 1861 he had a wife named Minnie, aged 29, but I do not know what her surname was. Minnie must have died before 1867 because he married Jean Waddell Oswald on 14 March 1867 at St John The Evangelist, Notting Hill, London. They had a son Henry Jean O, born 1869. Jean died in 1869, in the same quarter as the birth of Henry Jean O. On 28 June 1871 Henry married Catherine Wilson Oswald, who was Jean's first cousin once removed. Henry and Catherine had two sons and two daughters, and I think Henry must be the Henry Turner who died in Fulham in 1886, aged 55. Catherine and her children emigrated to America in 1893. Henry Jean O had died in 1877. I have the 1861, 1871, and 1881 censuses and all the relevant birth, marriage and death references except Henry's birth/baptism and Minnie's birth/baptism, marriage and death.