Lime Hawk Moth Mimas tiliae.
Pencil, watercolour and pen and ink.
A male I think, judging by its small size and strong colouration. However if anyone reading this knows better I stand to be corrected.
I found it dead on the path by the back door as I went out this morning. Possibly a victim of last nights strong winds and rain. A bit battered with its left antenna missing. It's the first one of this species that I have ever seen.