Wet Hillforts in Islay, or, Large-Scale Oblivion

I intended a light post to follow the last one, and this is lighter, but a point got in my way while I was drafting it, so it develops weight towards the end. We begin in September of 2021, when my then-partner, now-wife and I went for a short break to Islay. We loved it, but it was right at the end of the holiday season and the weather was, how to put it, fairly "soft". What this means is that, after passing on one drive a structure that seemed pretty obviously to be a hillfort, we decided ther