No interactions present.
Did you see the upperside of the wings of either individual or just this underside view? Was the upperside of either individual blue?
the upperside of the thorax of the nearer individual is blue. The other one is mating with it, so likely the same species.
Lat/Lng: 56.73, -6.1
OS grid ref: NM493673
Observed on the Ardnamurchan Peninsula - cannot recall precise location