This looks different to marbled whites.
No interactions present.
... this is an example of Melanargia galathea lachesis, also called the Iberian Marbled White. Interesting distribution map here.
The upper side black markings are quite reduced and there is a just a dark smudge at the wing roots.
You might want to add the scientific name to your initial observation. ;-)
Lovely picture, by the way!
That's brilliant. Thank you for your help.
These are very common in the foothills of the Pyrenees in the Alberes hills.
Lat/Lng: 43.2741, 2.8777
Found beside the river Cesse