This holds a wide range of reports, legislation, journals and other publications. It is produced by Sweet & Maxwell, so often contains documents not found in LexisLibrary (from LexisNexis). Westlaw offers various research tools, including ‘case analysis’ which shows the history and subsequent treatment of individual UK cases.
Note that for international materials you will need to click on the (rather small) ‘Services’ link toward the top of the screen, then on ‘International Materials’.
To set up your own 'My Westlaw UK Profile', first create an account. This allows you to register for alerts on topics of interest and to keep a research trail.