In the just published New Naturalist volume Grasshoppers and Crickets by Ted Benton there is a picture of what is said to be the green form of Chorthippus brunneus (page 391).  The specimen has a slight olive tint but it differs so much from the green ones I see annually on the Bournemouth cliffs that I thought it worthwhile posting an image here for comparison. This photo was taken on 1 Aug 2010.

Michael Skelton