Swallow-tailed moth / (Swallowtail) Ourapteryx sambucaria

Swallow-tailed Moth Flash has over-exposed the top of this Swallow-tailed moth.
A big moth, wingspan 45-55mm; UK flight time Jun-Aug.
Swallow-tailed Moth A different individual in daylight -- note the "eye-spots" near the tail.
Swallowtail Moth
Swallowtail Moth