http://en.wikipedia.org/wiki/Constance_Babington_Smith
http://en.wikipedia.org/wiki/Messerschmitt_Me_163
It explains the 3D technology being used to spot the V2 site in Peenemünde in great detail.
It certainly kept my attention for an hour.
Also has a few nice little interviews/videos tied in to it, and there was a full documentary aired around the same time.
http://en.wikipedia.org/wiki/Constance_Babington_Smith
http://en.wikipedia.org/wiki/Messerschmitt_Me_163