I was just over @Gamesdomain.co.uk when I saw they had Unreal Tournament 2003 Demo listed as 26 November and the file size is now 141mb.

Update: I did a quick search of Infogrames and the build is Demo_v1142.exe

Download New Unreal Tournament 2003 Demo

ftp://ftp.infogrames.net/demos/ut2003/UT2003Demo_v1142.exe