Found this dropping in the garden on top of a rock by the bird feeders.
No interactions present.
It is looking more likely that this is a Pine Marten's dropping, I now have a photo of a Pine Marten on our bird feeder see http://www.ispot.org.uk/node/119922?nav=users_observations
Wildlife of Assynt
Managed to get a video of the Pine Marten, it is on YouTube - http://www.youtube.com/watch?v=ecvVZgoqRPU and http://www.youtube.com/watch?v=xmZ5HaZ7juo
Looks right and in a typical place.
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Lat/Lng: 58.1, -5.3
OS grid ref: NC0720