About 2m high. At edge of woodland path. Thanks to Vinny and landgirl for I.D.
No interactions present.
Just checked on NESBReC (NE Scotland Biological Records Centre) and the common blue sow-thistle is recorded at exactly the right location. There is no records for the hairless blue in this corner of Scotland.
The BSBI hectad maps have 3 sites for C. plumieri in this general area, and is a much more reliable source than record centres which, in my experience, are full of errors. How many casual recorders would even be aware of there being more than one species? C. macrophylla is much more common, but the absence of hairs rules it out completely.
Lat/Lng: 57.4739, -2.7948
OS grid ref: NJ524429