Hill Barn part 1 is a micro containing a six-figure number ABCDEF.
Hill Barn part 2 is at N 51° 49.FED W 002° 04.CBA, some way down an overgrown bridleway. If for any reason you miss the micro (perhaps the sheep ate it) then the hint plus a bit of geo-sense should be sufficient to guide you to the right place.
Note: it is not necessary to move any rocks; please leave the dry stone wall untouched.
Hill Barn is one of eight caches around Cowley County Parish ... why not get out there and see them all! I recommend tackling the circuit anticlockwise, starting/finishing at Cowley Village.