Is there really a book called The Splendid Decision ? I just did an online search and couldn't find that title. It came up with Bombing Vindicated by J M Spaight. He calls the decision to target civilians as a "splendid decision".
There is a review of Bombing Vindicated here - http://www.inconvenienthistory.com/arch ... icated.php
The whole book is online here - http://www.jrbooksonline.com/spaight.htm
I'm also only aware of the "Bombing Vindicated" book.
Mass bombing far behind the enemy lines, was something the British planned on for quite a while before WW2.
https://archive.org/details/Considerati ... eMarch1938
This document makes clear that Germany was the primary enemy from the British Perspective: