I see that my post is now 3½ years old but your response confirms why I put it up there - that one day it may strike a chord with someone.
Isabella Julia was the eldest sister of my mother's grandfather. You no doubt know that the name Isabella (or names Isabella Julia) were repeated. My mother's mother was Julia and her eldest sister was Mary Isabella. I can explain those names.
A cousin was in Dublin recently and established contact with David Heather. I can send a photo.
I know a considerable amount about this part of your partner's ancestry but I won't go into it now in case of relating what already may be known. Does he know, however, that Isabella Julia's father's name was Halpin? Her mother was Villiers. On the other hand, I know practically nothing about the Thorpe side.
Lilya, would you prefer to contact me directly via wbwebster at internode dot on dot net.