Just wanted to post that I learned today that this legendary police officer has died at the age of 104. Leonard worked on both the Evans and Christie cases, and had strong opinions on them.
He was interviewed on the Black Museum ITV documentary in 1988 about the case, and by the Imperial War Museum, in a massive interview about his life's work, which is available to listen to on their online archive.
RIP to a good copper.
My book, available here