Hi Petty Officer Tom
The carte de visite photograph of Archibald B. Milne was taken by Mr. Jabez Hughes; Royal Photographic Studio (Photographer to the Queen and H.R.H. The Prince of Wales); Regina House; Ryde, Isle of Wight.
Milne was quite favored with the royals, who called him 'Arky-Barky,' and spent a lot of time visiting them. He served on the staff of no less than four kings. (Ian Knight, Who's Who in the Zulu War 1879, page 147.