[Hampshire] sarge to etch - missing keys

I'm still trying to upgrade Sparc sarge to etch, with missing keys, and
I think I am down to the simplest problem.

If I run:
lofty:/tmp/apt# apt-key update
gpg: key 2D230C5F: no valid user IDs
gpg: this may be caused by a missing self-signature
gpg: key 6070D3A1: no valid user IDs
gpg: this may be caused by a missing self-signature
gpg: key ADB11277: no valid user IDs
gpg: this may be caused by a missing self-signature
gpg: Total number processed: 3
gpg:           w/o user IDs: 3
lofty:/tmp/apt#

I first tried
lofty:/tmp/apt# gpg --keyserver wwwkeys.eu.pgp.net --recv 010908312D230C5F
gpg: requesting key 2D230C5F from hkp server wwwkeys.eu.pgp.net
gpg: key 2D230C5F: no valid user IDs
gpg: this may be caused by a missing self-signature
gpg: Total number processed: 1
gpg:           w/o user IDs: 1
lofty:/tmp/apt#

Then tried:
lofty:/tmp/apt# gpg --allow-non-selfsigned-uid --keyserver 
wwwkeys.eu.pgp.net --recv 010908312D230C5F
gpg: requesting key 2D230C5F from hkp server wwwkeys.eu.pgp.net
gpg: key 2D230C5F: accepted non self-signed user ID "Debian Archive 
Automatic Signing Key (2006) <ftpmaster@???>"
gpg: key 2D230C5F: "Debian Archive Automatic Signing Key (2006) 
<ftpmaster@???>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
lofty:/tmp/apt#

followed by:
lofty:/tmp/apt# gpg --armor --export 010908312D230C5F | apt-key add -
gpg: key 2D230C5F: no valid user IDs
lofty:/tmp/apt#

but even after that I still get the same response from "apt-key update".

I'm getting to the stage where may I wipe and install etch from scratch,
but that goes against my hacking principles!

Any ideas?

Thanks,
Simon