Fortunately, the Supreme Court has a Practice Direction on this very topic!
Practice Direction No. 16 of 2013 emphasises the importance of case authorities that are limited to those which are most apt to materially assist the court in resolving the dispute.
The Practice Direction is a practical reminder to only cite cases ‘which are necessary to establish the principles or propositions which are relied upon.’ The practice of including a long list of cases that ‘merely rephrase, illustrate or apply those principles or propositions’ in a way that does not materially assist the Court in resolving the matters in dispute’ should be avoided. […]