I've seen quite a large number of people looking for a copy of the last .uk zone file (from ~2003). Whilst I have a copy of this file from back then, the value of this is negligable as so many new domains have been registered, and so many no longer exist. So what's the next (or the) best thing then? There's domain name lists available at http://viewdns.info/data/ for a number of different ccTLD's including .uk. These lists are of valid, registered domain names and are custom built and all domains validated in May 2011. In the example of the .uk list, it contains many more domains than the last available zone file. Hope this is useful to everyone!