I've just been in touch with Sam and mentioned a copy of a hand written "pedigree" relating to the Maltby family which starts in the fifteenth century, which I have.
In fact this is a "Brough Maltby" pedigree - prepared for a certain Brough Maltby (I cannot remember why).
I suspect it may cover some of the same ground as the transcription from the diary Mary-Rose mentions.The pedigree I have may contain some additional info.For example, it has birth/mar/death dates for both William Maltby and Jane Brough.But it does not, for example, show George Brough's wife.
The pedigree shows some more ancient Maltbys (Sam - ie the stuff that matched your records).Then it follows the line of William and Jane's son - George born 1638 - through another seven generations, to the family of a Brough Maltby born in 1878.
If more of these details are of interest to either of you, let me know.