No interactions present.
Size can be useful to distinguish between these closely related species. For Epiblema scutulana/cirsiana, dissection can be problematic (see http://www.dissectiongroup.co.uk/page365.html)as both the males and females seem to lack any differences. Have you looked at the "Bird-dropping Tortrix Moths of the British Isles"?
I havent looked at any bird dropping moths in a long time, unless I was looking at them on UKmoths the other day under their scientific names only, I did notice a few Tortrix as I flicked through the micro's looking for this one.
Their images of E. cirsiana and E. sticticana seemed to have quite a lot of blue on both, scutalana seemed to look more like mine but the text did say they were hard to differentiate between so maybe looking at one example image isnt enough for IDing these.
Unfortunately my pics above are not the best quality either.
Thanks, will look up bird dropping moths again as you suggest.
Lat/Lng: 55.004, -6.029
OS grid ref: NW424751
Rough pasture hill side.