The recent accessions page on BAILII shows that a number of leading judgments from the 17th century onwards have recently been added. These are the first fruits of the BAILII/JISC Open Law project which aims to identify significant older judgments to which reference is regularly needed in legal education.
JISC is the Joint Information Systems Committee of the UK further and higher education funding councils.
You’ll also be able toaccess these leading cases using Lawfinder.