Have you seen this moth?

Having taken a pretty keen interest in wildlife as a kid, I'm always surprised to see an insect I've never come across before. Does anyone know what this rather lovely moth is, enjoying the view from the top of my mint?

Of course, I know you'll probably tell me it's the blighter that destroys my peas in their pods or produces those wormy green grubs I keep finding in my soil, but it's good to know the enemy too...