Here's some light reading for Danny and yourself MPN11
:-
http://www.jlab.org/ir/MITSeries/V2.pdf
Our interest begins at page 327 (ie GCA) but there is an amazing picture at 203 showing aircraft formations coasting out from Southern England and coasting into the Cherbourg Peninsula on D-Day. I'm afraid that the pictures leave much to be desired in clarity but the whole pdf file can be downloaded and saved to PC (or even an ebook). The counter at the top seems to be synchronised to the books page numbers (for a change!) while scrolling down at the RHS.