Most UK law reports are available online from Westlaw UK. Westlaw UK provides the best starting point for England and Wales, UK Supreme Court and selected EU (European Court) cases.
From the Westlaw UK home page use the 'Cases' tab to search for reports by citation or party name, e.g.
[2008] 1 AC 153 (citation - the best option if available)
R (Al-Skeini) v Secretary of State for Defense (party name)
