I sat on this cache for a week (not literally), because all I could think to call it was 'Spare Cache', which was a bit rubbish. Then, wanting to link it to the Pig Trails series, I came up with a connection to the obvious local feature - et voila, a perfect name and an addition to my series.
This naturally follows on from Charlie's cache.
Please do not attempt to access from the nearby main road.
There are a couple of paths to this from South Queensferry, and a good one from Dalmeny.