This is a long shot; but perhaps this might mean something to someone.
An ancestor kept a diary in the last few months of his life in 1895, and at the back of it is what looks like an address book: he has listed some names and addresses, a couple of whom I recognize as having belonged to family/associates of his.  One of the entries on the list reads, rather cryptically, "12/ officers of the S.P.C.K. Northumberland Avenue, W.C."  Does anyone know what these initials might have stood for -- do they possibly indicate a military connection?  A particular military battalion, perhaps?  There are gaps in my knowledge of this man's life, but he did come from a military family.  When I googled the initials S.P.C.K. what came up was the Society for Promoting Christian Knowledge; but that doesn't seem like a good fit for him. 
As I say, this is a long shot; but if anyone has any ideas about those initials I'd be delighted to hear them!
CELTICANNIE