Mega Moth!

So at about 3am in work I turned around and saw this hanging on the blinds! I thought that someone had just driven away on a Harley but I can only assume that it was the sound of this thing landing!!
I have no idea what type of moth it is but it was the most interesting thing that happened overnight to photograph!!
I wasn't going to try and get any closer incase I got sucked into the downwash of it taking off!!!