Mystery bug

Didn't get out to take any photo's today (Saturday) due to the rain and a couple of other bits I needed to sort out, so I'm blipping another photo from my trip to Dawlish and Dawlish Warren on Friday.
This is one of the two 'wildlife' subjects I found at Dawlish Warren, I love his metallic green colouring. The reason I am blipping it though is because I have no idea what it is and I'm hoping somebody out there in blipland can tell me.