Excellent question (and excellent username!)

Carter Ground is no longer a working farm, so I decided to verify the age of the buildings using Victorian OS mapping. See here: https://maps.nls.uk/geo/explore/side-by-side/swipe/#zoom=18.0&lat=54.3212&lon=-3.1868&layers=6&right=osm

This confirms the buildings are indeed old farm structures, and I'm content they would have originally been barns based on their physical appearance. It also confirms the walls to the north were originally another building.

I'll follow your suggestions now. Thanks very much!