One would be forgiven for thinking this is a butterfly. This is a large pale lemon moth with distinctive pointed hindwings with two reddish-brown spots on the bases. There are darker cross-lines on the forewings and hindwings. The colours fade as it gets older and it becomes whiter. Wingspan 40 to 50mm.
The adults fly June to mid-August. They are attracted to light, and are found in woodland, hedgerows, parks and gardens. A fairly common and widespread species.
The larvae feed on various broadleaved trees and shrubs.
Photographs taken in June 2014.