I hadn't spotted my own name on Andy's list!
Yeah, too unfit, too slow. Got to Quedillac, had a good feed and a bit of a nap, but it was obvious when I set off that I was still too tired to do anything other than struggle. So I made sure I'd done 400km outwards, then turned and rode back.
Good to have a different, very leisurely look at the controls - but slightly shaming to, despite having had a couple of good nights' sleep, still be passed at speed by groups who had started 10 hours later and ridden 400km more than I had.