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This is indeed a grasshopper. I'm not sure which species, but the Common Green (Omocestus viridilus) seems plausible to me.
The easy thing to look for is the antennae: short and stout = grasshopper; long and graceful = cricket or katydid.
More differentiators here - http://insects.about.com/od/identifyaninsect/a/grassorcricket.htm