This is an odd situation where I have been investigating a family before a "lost album" has fallen into the distinguished hands of Mary Lennon. As an amateur genealogist, when you come across a couple of surnames that you've seen before, you normally dismiss this as meaningless coincidence but this time, after a double-take, it was clear it was a path that had been visited before. So this is less of a puzzle than usual !
As coincidences go, I have literally hundreds of trees and diverse interests in many things across Ireland and Britain so it was bound to happen eventually. We also find that one of the extended family has been mentioned on the Lennon-Wylie site previously (at least once) as it has previously caught my eye. This is not surprising either as the Symes family was absolutely huge and they had diverse practices from law, architecture and medicine so are quite heavily intertwined with life in Victorian Ireland.
Mr. Symes, 58 Lower Dominick Street, Dublin - is the architect Sandham Symes (1807 - 1894)
His mother was Barbara Warren ( and this is how he is connected to the Warren family and Robert Warren of Killiney for whom he designed some impressive premises.
For more on their Killiney connections, see this excellent site maintained by architect M. McShane : https://killineyhistory.ie/
Other connected families are Swan, McNally and Taylor.
In the book Bank of Ireland Staff Service Record (also scanned by Mary) we find Private Thomas Arthur Symes (Royal Dublin Fusiliers) who was son of Sandham J. Symes, Esq., of Hill View, Tinahely, Co. Wicklow who is related to but not to be confused with the architect of the same name above. They recycled the name Sandham in the family.
The photographs with good biographical details state:
Mr. Warren of Killiney, brother to Aunt Sue & to our Grandmother - Mother sends these photos with her love!!
Old Aunt Sue, Mrs. McNally, who was a Miss Warren of Killiney and a sister to our Father's mother, our Grand Aunt
"Mr Warren of Killiney" is Robert Warren jnr (1787-1869). Mrs. McNally is Susanna Warren (1789-1877) wife of Richard McNally.
The family perspective in question is, by deduction, those descendants of Barbara Symes née Warren - which accounts for the photo of Sandham Symes (1807-1894) in their possession. We can then revisit some of the other photographs and try to work out who everyone is, perhaps !
Your ???? - This looks like W. Sandham Symes - which is probably William Sandham Symes (1850-1903).
Who is Mr. S. J. Moorhead, Northern Bank, Balbriggan, Co. Dublin ?
Samuel Johnson Moorhead and his family can be found on the 1911 census. He is from Monaghan and note Monaghan photographers.
What is the connection ? Look for a Moorhead and Symes wedding on Irish Genealogy site. Only one!
So Samuel's wife is Louisa Barbara Symes (~1854-1916) - married 3rd Nov 1887 St Stephen's Church, Dublin.
Her father is William Symes (1818-1901) - one of many children of Sandham Symes (1771-1845) and Barbara Warren (1783-1825) as mentioned previously.
This then provides a clue to the L.M. album initials - this is likely Louisa Moorhead.
William Sandham Symes (1850-1903). was her brother.
Remount riders are those who train horses.
"Mickle Borough" is likely Mickleborough
No clear ideas as yet but may come back to it.