Current practice
For help with finding & using Hansard (online or in print on the Ground Floor) and other government official papers, please start with the special guide below, created by a Bodleian Official Papers colleague
Chapters in introductory works on learning English law will naturally include a chapter or more on this. They can be useful first steps. One example is
But naturally there are books looking at this issue in detail - from academic to practitioners to philosophical analysis. Some examples are below