Who are they?

From the family album .
Gilly send us two mystery portraits and info.

As to date again I have done a search and with it having a number on the back and the studio only opening in 1871 I think it is C. 1875. That would make Sarah Ann Vlieland the most likely candidate. Her family lived in Norwich, so she might have had it taken whilst visiting them

Could this be Arthur Heath Vlieland, I wonder if he went to Oxford? I have done a search for Hill & Saunders, the photographer but no joy as to its date.