A few months before you created the the Cape Wrath Trail relation I've hiked the southern part of this hike myself. I remember that there are no signposts, so the route is not visibile on the ground. Following the OSM consensus to only map what is visible on the ground, the route relation should not be in OSM.
Had the route been signposted by August 2016?
I meant 2015 actually :).
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