Light Arches Moth Some Common Blues (in several of the above photos) tend towards "whitelegged-ism" but the blue male White-legged Damselfly looks very different and has totally white legs. Apamea lithoxylaea

Light Arches moth
Light Arches moth
Light Arches moth having a drink.
Light Arches moth Wingspan: 43-50 mm
Light Arches moth UK flight time: May-Aug