There was also a book published by the airport to commemorate it's 40th birthday which has some good aerial photos of the wartime airfield. I have a copy somewhere and, if I can find it, I'll try and get the photos up on here.
With regards to the post war grass strip, it was certainly still there when I first started flying from EMA in about 1979 but I can't remember ever using it. It ceased to be when the Orion offices were built as stated above. There was also a signals square in existence at this time situated in front of the old ATC tower.