A scrapyard perhaps, or a specialist in removing vomit-stains!
It's good to know they'll do at least 160k miles though
In the photo of the driver's footwell, I reckon you could sow seeds in that carpet.
On paper they're probably worth scrap value. I'm sure someone would be glad of a run-into-the-ground banger, but £800 is too much IMO. Perhaps £400 might get a bite, especially as 4 of 5 have no MOT. If I was selling a car that wasn't faulty I'd get an MOT on it. No MOT makes me wonder what's wrong with it.