Debian Etch (4.0 stable) package problem

I'm getting errors upgrading from 1.6.2-1~pgaoetch1 to 1.6.3-1~pgaoetch1 
via the UK mirror ftp2.uk.postgresql.org

Get: 1 ftp://ftp2.uk.postgresql.org etch/pgadmin pgadmin3 
1.6.3-1~pgaoetch1 [4330kB]
Get: 2 ftp://ftp2.uk.postgresql.org etch/pgadmin pgadmin3-data 
1.6.3-1~pgaoetch1 [2722kB]
Fetched 7053kB in 56s (124kB/s)
Failed to fetch 

ftp://ftp2.uk.postgresql.org/sites/ftp.postgresql.org/pgadmin3/release/debian/dists/etch/pgadmin/binary-all/misc/pgadmin3-data_1.6.3-1~pgaoetch1_all.deb
Size mismatch
 
E: Unable to fetch some archives, maybe run apt-get update or try with 
--fix-missing?


Checking the download:
ls -l /var/cache/apt/archives/partial/
total 2664
-rw-r--r-- 1 root root 2722978 2007-05-24 19:24 
pgadmin3-data_1.6.3-1~pgaoetch1_all.deb

This appears to match the size on the server.

The reported size in "Packages" and as reported by "apt-cache show" is 
2722412

Packaging issue?

--   Richard Huxton  Archonet Ltd