The Silver Y moth (Autographia gamma). it's a medium-sized, silver-grey moth with white y-shaped mark on the forewing.
This one was one of many seen recently, feeding during a nice warm day. The silver Y is one of the world's great migrant insects, and travels from warmer climes each year to breed in the UK and Northern Europe. It cannot survive our winters.
Better viewed larger.
Thank you for visiting and I hope you have a Great Friday and weekend :)