Small Blue Butterfly spotted flitting between nettles.
No interactions present.
Could it be a Little Blue (Cupido minimus)? My guide shows additional markings along the wing margin for a Holly Blue which appear to be absent on your photograph.
I see what you mean about Small Blue, but this one is definitely a Holly Blue. It's a bit worn around the edges, so that ay explain why it doesn't look quite like the one in your guide, but the position of the black spots on the undersides is correct for Holly Blue.
For more info on the two species see UKbutterflies:
Entomologist and biological recorder
Thanks for the clarification.
Lat/Lng: 50.9, 0.7
OS grid ref: TQ9219