I have just found this forum and hope you are still interested in the Whitburns of Gwennap, Cornwall!!
I am descended from Matthew Whitburn and Ann Williams who were born and also married in Gwennap. They had 7 children, one of whom was another Matthew and he married Mary Uren in Gwennap.I am descended from those Gwennap Whitburns.
I would like to know more about these Whitburns if you can help with anything at all.