That was long while ago, I was in touch with a member of Sir Cuthberts direct line family who gave me the known tree and also I've searched available parish registers looking for others since I have Buckles too. However not all parish records have survived, there is always a possibility that Robert and Cuthberts line shared an ancestors there are very few records before the 1500's, but nothing to indicate a descendancty from Cuthbert or his descendents no other Roberts either

It was only Royals and those what were high enough up or linked to them. There are hearth taxes and window taxes and wills if the estate was over a certain amount but for that you need someone to do hands on, some wills are held with Nat Archives.