A long slow conversation, this one. I am or was one of the Ravenscrofts of South Africa. My brother John has the two books you were after, "The Family of Ravenscroft" published about 1917 and "Some Ravenscrofts," date forgotten. The first is the records back to dot and the second is some yarns about some of the less boring members of the family, same author.
When we got here in 1976 (self) and '77 (John) we found we were very late arrivals, but the main book was not readily available here and was welcome. We passed a copy on, I think, I forget to who; someone in Longreach. Rollo, maybe?
Here is a bit of trivia, that just may be a little old. My Dad, Tilson, said that he lost interest when he found we were second cousins to the King's bulldog. Someone way back was the Sheriff and Escheator of Cheshire. I don't know which was the senior post. Anyway, escheators were nicknamed "the King's bulldogs." They seized things for the king and so were a sort of local royal bailiff. Someone knew his genealogy and it was not Tilson. Tilson's Dad was Charles, who fought in the Boer War on the British side. Some of his brothers fought on the other side, and thereby hangs a tale ....
If not generally available, someone should put the two books on the net, in the public domain, somewhere where they will survive. Copyright must be long gone. My Mom added in pencil our own line in South Africa, but did not know many of the others.
Keep in mind that tracking a paternal line is inevitably a fiction, after only a few generations. If we claim the name, we have a full right to it in a social sense, but I bet DNA would show that none of us are related to Warin the First.