Muslin Moth

Another in the occasional series of apparently common things I've not seen before.
I thought it was an Ermine Moth when I found it, but it didn't look quite right, so some research and here we are. 

A frustrating day - so new desktop pc ordered, I need to accept tech has an ever shorter lifespan and bad tech often feels life shortening.
Turned nice in the afternoon, so took down some annoying tree branches and played with Missy. Result.