Package pools and Japanese Debian problems

[Neil Booth <neil@daikokuya.demon.co.uk>]

I use Japanese Debian, and ever since pools were introduced I've not
been able to update many packages at all without download errors, and
new revisions seem to be far less frequent.

Here is a typical apt-get example:-

monkey:/home/neil# apt-get install modutils
Reading Package Lists... Done
Building Dependency Tree... Done
1 packages upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
Need to get 173kB of archives. After unpacking 12.3kB will be used.
Get:1 ftp://ftp.debian.or.jp woody/main modutils 2.3.23-2 [173kB]
Err ftp://ftp.debian.or.jp woody/main modutils 2.3.23-2
  Unable to fetch file, server said '/debian-jp/pool/main/m/modutils/modutils_2.3.23-2_i386.deb: No such file or directory  '
Get:2 ftp://ftp.debian.or.jp woody/main modutils 2.3.23-2 [173kB]
Err ftp://ftp.debian.or.jp woody/main modutils 2.3.23-2
  Unable to fetch file, server said '/debian-jp/pool/main/m/modutils/modutils_2.3.23-2_i386.deb: No such file or directory  '
Failed to fetch ftp://ftp.debian.or.jp/debian-jp/pool/main/m/modutils/modutils_2.3.23-2_i386.deb
  Unable to fetch file, server said '/debian-jp/pool/main/m/modutils/modutils_2.3.23-2_i386.deb: No such file or directory  '
E: Unable to fetch some archives, maybe try with --fix-missing?
monkey:/home/neil# 

Note that apt-get update works fine.

Here's my sources.list:-

deb ftp://ftp.debian.or.jp/debian-jp woody main contrib non-free
deb ftp://ftp.debian.or.jp/debian-jp woody main contrib non-free
deb ftp://ftp.debian.or.jp/debian-non-US woody/non-US main contrib non-free
deb-src ftp://ftp.debian.or.jp/debian-jp woody-jp main contrib non-free
deb-src ftp://ftp.debian.or.jp/debian-jp woody main contrib non-free
deb-src ftp://ftp.debian.or.jp/debian-non-US woody/non-US main contrib non-free

What's wrong?  TIA,

Neil.