Blackish with a purple sheen especially around the edges.
No interactions present.
Could it be the other species of Violet Ground Beetle: Carabus problematicus?
I was just thinking the same thing Grant. There might be just a bit too much finely ridged texture on the elytra for violaceus but I'm not 100% sure with this one.
Had another look, it doesnt seem ridged enough for problematicus in my opinion(for what its worth). I do see a lot of problematicus but not violaceus as it isnt in Ireland.
Lat/Lng: 53.3463, -2.6807
OS grid ref: SJ547834