Okay I did NOT do this one. Site was naughty all on its own. As you can see its coming back up slowly.
I am uploading a copy of the site and will try a more robust restore once its done. Failing that I actually look for whats not linking right and sort it. Why am I not just doing that in the first place? Because something made the site go boom, I dont know what it is at this time, so going back to a working copy is just the right move.