>Anyway, what precisely should I be using for my sources.dist file? Try this:
# United Kingdom deb http://www.uk.debian.org/debian stable main contrib non-US non-free deb http://www.uk.debian.org/debian frozen main contrib non-US/main non-US/contrib non-US/non-free non-free deb http://www.uk.debian.org/debian unstable main contrib non-free deb http://www.uk.debian.org/debian potato main contrib non-US/main non-US/contrib non-US/non-free non-free deb http://www.uk.debian.org/debian woody main contrib non-free deb http://sunsite.org.uk/pub/packages/debian stable main contrib non-free deb http://sunsite.org.uk/pub/packages/debian frozen main contrib non-free deb http://sunsite.org.uk/pub/packages/debian unstable main contrib non-free deb http://sunsite.org.uk/pub/packages/debian potato main contrib non-free deb http://sunsite.org.uk/pub/packages/debian woody main contrib non-free deb http://sunsite.org.uk/Mirrors/non-us.debian.org/debian-non-US potato/non-US main contrib non-free