Looks like that list hasn't been updated since our domain switch. If you really want to block our internal analytics (which are in practice fairly harmless) replace "hits.guardian.co.uk" with "hits.theguardian.com".
Now, if they voluntarily stopped tracking all or a significant portion of their users, I would be shocked.
Of course, that isn't going to happen.
Surely it is better just to get the data from your own content web server logs ? Wouldn't you get the same information while saving on the extra HTTP request? It would make the site loading times slightly faster as well.