Confidence: I'm as sure as I can be.
Notes: This is intriguing! It is a male bohemicus or vestalis, and the antennal segments suggest the latter. B. vestalis was only confirmed in Scotland for the first time a couple of years ago, but this looks as if it might be another one - the yellow on the tail is dark for bohemicus. However, the two are tricky, and we would really need a specimen to be certain.