[clug] Is mirror.linux.org.au/debian broken?

[Drew Parsons]

I've configured my Debian apt to use the local anu Debian mirror at
ftp://mirror.linux.org.au/debian/

For the last several days the update step has been complaining
W: GPG error: ftp://mirror.linux.org.au unstable Release: The following
signatures were invalid: BADSIG 010908312D230C5F Debian Archive
Automatic Signing Key (2006) <ftpmaster at debian.org>

That is, the signed packages facility is not working.
Is the mirror broken?

Drew