Here's the answer.
Hi
Thanks for getting in touch. It was an internal mis-configuration in our new server. It's fixed now, though they might be sporadic disruptions for the next few days while I move the entire Old Car Manual Project collection over. There's around 700k files.
Please try reloading any pages that don't work, and if you could let me know if there are any persistent problems, that would be helpful too.
Regards,
Rusty