A few years ago I worked on a very interesting programme called Secrets of Underground Britain. We filmed at an Auxiliary Bunker and interviewed a former member. One of the tasks that the Auxiliary would have to undertake should an invasion occur, would be the assassination of key local figures that may have been of use to the German forces. The Auxiliary had a list of names and our man told us that after the war he would see some of the targets in the street and smile to himself...
I’m a bit late to this, but I have all three of the underground DVDs, and think they were informative and well made.
Edited to remove a ‘yokel’ predictive text error.