European Gardening: Name that Moth, 1 by Baa

Baa wrote:
I went up to check the duck pen was secure last night and spotted a Whacking Great Big Moth hanging on the netting of the pen. I have large hands and long fingers and the moth is about 5 - 6cm across

I assumed it's a Hawk Moth and have been looking it up but the closest I can find to it is the Lime hawk moth Mimas tiliae but it's forewings aren't nearly so scalloped, is this simply a varieation?

When I looked this morning he was still hanging on the fence, if he's still there I'll try and take another piccie.

Any Lepidopterists among us here who can confirm or scoff at my ID attempts please? :)