Hi MatterdaleMan, thank you for the information regarding Threlkeld church, my story is a bit convoluted but I think there may be a link with the Red Sykes family, I believe it may be through Isaac Gillbanks born 1691 the son of Thomas Gillbanks of Red Sykes, who married Grace Vertue of Penruddock, at Greystoke 1685. Isaac along with his siblings Frances and John were born at Penruddock, Thomas died there1702. I have been unable to trace the children after their births but believe Isaac may have moved to the Furness area where he, and his descendants, used both Gillbanks and Banks surnames. As William lived at Red Sykes I presume he may be a close relative of Thomas'. As to proving a relationship, that would entail a possible yDNA test, if a proven descendant of William could be found to volunteer for such a test. I have already proved my relationship with another Gillbanks family in this way.
PS Is/was Red Sykes a farm or Hamlet, I can't find it on Google Earth?
Regards, Jim.