Several feeding on a flower head of hogweed in behind dunes. One was noticeably bigger than the others.
No interactions present.
armatorius has 2 yellow bands in the male, and more in the female, not one broad yellow band. Compare previous images on iSpot
I have been told they are tricky! Not sure that there is a red one. I wasn't aware at the time. It may be just looks red through the wings.
as a matter of interest how did you id the armatorius?
Lat/Lng: 57.935, -4.0103
OS grid ref: NH810957
On hogweed in behind dunes. Among marram grass.