Hi all!
And sorry for the long LONG gap between posts in this. My life kept getting in the way of my research.
Anyhoo, just to update this line of investigation...
Having got in contact with other family members I now know that James Wylie and his wife, Jane Anderson ran a shop in the main street of Saintfield and inherited the family farm at Tullygarvan, Ballygowan, both presumably coming from the Anderson side of the family. They ran the shop for several years and the farm then came down the line to my father Albert and his youngest brother Matthew (known to the family as Andy) who turned it into a riding school.
From further research into the fabulous hints I got here, I am fairly sure Jane's brother George Anderson and his wife Emily ran the shop before it came to my grandparents. George and Emily don't seem to have had any children. That then begs the question of what happened to David and Matthew Anderson who seem to have disappeared. Same for their sister Margaret.
Further back the strong link to Ougley, Ballygowan remains and I am wondering if this IS the farm in Ballygowan which eventually ended up on my side of the tree.
The biggest problem is still the number of Andersons there and how they all very helpfully inter-married. Richard seems to be a recurring name and there are several of them in the tree with connections to Oughley. I am also convinced there is a Waddell connection and that it may have been an aunt/uncle or cousin who married into that line which in turn prompted my grandmother to name one of her sons Robert Waddell Wylie. Her eldest son may also have been influenced by it when he became a Presbyterian minister. So, while I understand that the Rev. Robert Anderson was from Inch in Co. Donegal, I can't help but wonder if his wife Mary Anderson is the connection there. As mentioned, it was their daughter Mary who married Rev. John Waddell.
All still a bit of a maze basically! But I thought I would pop by with an update

MANY THANKS AGAIN to all!