I hope you don’t mind me contacting you, but I saw that you had posted about the ‘Serjeant’ family.
I am trying to find information and connection for Thomas Allen Serjeant (born 1871 in Cambridgeshire) shown in 1911 as the son of Charlotte Mace (nee Serjeant). He is a photographer and resident with his mother at Granville Buildings, Chigwell Road, South Woodford. She is shown as a Widow – Occupation: Confectioner.
I presume Charlotte is the daughter of John Serjeant (born abt 1795 in S Haslingfield, Cambridgeshire - died 6 Jul 1880 in Haslingfield, Cambridgeshire) and Anne Maria Bush Thurston (born 21 Sep 1800 in Sutton, Isle of Ely, Cambridgeshire – died 25 Jan 1887 in Cambridgeshire), She is a sister to your mentioned Alfred.
Charlotte married John Mace (in 1875 in Cambridgeshire) and their children are shown as Allen, Henry James and Walter Daniel.
I am not related, but am researching early photographers in East London.
I did try emailing you, but your email is no longer available?