I finally got round to installing Debian Sarge in a chroot (it was amazingly quick and easy using debootstrap), mainly so I could test packages. I've found that my most recent release of Kio-Sword doesn't work in Debian Sarge (I presume a C++ ABI problem), so I've now rebuilt and the new version works in both Debian Sarge and Ubuntu Hoary. You can get it here:

https://lukeplant.me.uk/debian/kio-sword_0.1-3_i386.deb.

Or you can add these lines to your /etc/apt/sources.list and use apt-get:

deb https://lukeplant.me.uk/debian ./
deb-src https://lukeplant.me.uk/debian ./