Thanks Janice, interesting point re the Chameleons.It is indeed.
I found one the other day that was a completely different colour to the original green one I had photographed before!!
It had a lot of dark maroon colour on it as well as the green and I noticed it was crawling on the grass in patches of a very short weed of the same colour. Was wondering if they use the same effect as chameleons?
AHA.. there are half a dozen different types and yours is indeed a Green Shield Bug and mine was a Hawthorn Shield Bug I think.
It's a nymph rather than the adult.
They go through 5 nymph stages (known as instars) before a final skin shed that makes them an adult.
I think this is a 3rd instar