Not Lt.-Col. John Scott. But a photo of the type of uniform worn by the The Cape Town Highlanders. Be it (1896-97)
1879Graves. Found this.
"Newly-formed Cape Town Highlanders in July 1885. In 1891, the Dukes took over the Cape Town Irish Volunteer Rifles, and in 1894 the Regiment formed a mounted company.
From February to August 1897, the Dukes were on active service in Bechuanaland, as part of a government military operation to capture dissident Tswana leaders who had taken refuge in the Langberg mountains."
So we are looking between 1885-1891. Not Zulu War era.