Westlaw UK Insight, the first tab from the left on the navigation bar from the homepage, is an online legal encyclopaedia that aims to provide the user with a comprehensive overview of the law in the United Kingdom. The picture below show you the example of the breakdown of subtopics linked to the concept of pollution:
Legal content can either be searched or browsed. Each article is structured to provide the user with a brief but comprehensive overview of the topic including the references to significant primary and secondary sources.
The “Cartwheel” search tool, developed by American law professor William P. Statsky, also recommended by BIALL, the British and Irish Association of Law Librarians, will help you to find terms associated with the topic of your search.
This tool could be integrated with the information on Westlaw Insight to develop a comprehensive research on a specific topic.
Picture from Clinch, P. (2001) Using a law library. A student's guide to legal research skills. 2nd edition. Oxford: Oxford University Press.