Butterfly ID Challenge!

Well this is a shot in the dark as I have no photo. A roadside pink Silk Tree was covered in large white butterflies (the size of a swallowtail but ‘normal’ butterfly shape) with nearly translucent wings and a darker buff/grey edging and kind of struts that made it look like one of those very early aeroplanes/winged man contraptions. It had quite a large body too. Have tried various search terms but no joy yet. Nearly translucent white butterfly with aeroplane-like struts just didn’t cut it.
Any suggestions? I would love to get to the bottom of what they were!
Any suggestions? I would love to get to the bottom of what they were!
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for the fag ends of the aristocracy.
https://en.wikipedia.org/wiki/Polyommatus_albicans#/media/File:Lysandra_albicans_M_2.jpg
Edit. The size seems to be wrong - this is small.
Box Tree Moth - not my photo.
Fortunately I don’t have any box, but I do have euonymus, which I believe they are also fond of. Hmm, not so much of a friend, perhaps.