The poor old thing looks as though it's seen better days Steve, doesn't it?
Have a look at the Pine Hawk moth. This is a large European moth, wingspan 7.8 - 8cms, forewing grey-brown with blurred bands, delicately mottled, hind wing brown, fringes narrow with alternating dark brown and white - also blurry.
I can't find anything else in my books as large with that colouring, so perhaps someone else will come up with something if you don't think this is the right one.