[bitfolk] Apt errors

Hi all, Newbie here.. Be nice! I'm running Debian Etch 2.6.18-6-xen-686 and am getting error 404 when I run apt-get update. Am I right in thinking that I need to update my /etc/apt/sources.list file? What are the correct, Bitfolk cached entries? Thanks, Alex ps. The current file contains: deb http://apt-cacher.lon.bitfolk.com/debian/ftp.uk.debian.org/ debian/ etch main contrib deb-src http://apt-cacher.lon.bitfolk.com/debian/ftp.uk.debian.org/debian/ etch main contrib deb http://apt-cacher.lon.bitfolk.com/debian/ security.debian.org/ etch/updates main contrib