In February 2019, I happened to have lunch with Gina Miller and her husband Alan near Berkeley Square. We talked about politics, of course, and I recall myself saying, “We’re about to find out where power resides in our system.” I didn’t know then that I was sitting opposite the person who would go on to stress-test that idea in such vivid terms, as Gina would with Miller II. But I was thinking more generally about the referendum result and its ramifications – indeed, about politics in general. In the UK, does power reside in parliament or in the civil service? Or is it really to be found in the court system? Might it even – strange notion – be said to reside in us, the people? That lunch came back to me as we began compiling our justice research – to be published this year as part of the Westminster Index – outlining the most influential people within this field. Who wields influence and to what degree? How did they acquire it? And what do we need to know about them in order to engage...