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Looking at the photograph again I notice that the two largest grasshoppers actually look quite different. The one in the foreground has longer green fore wings with brown face, legs and a lighter colour to the abdomen. The one behind it has shorter brown fore wings with green face and legs and a darker colour to to the abdomen. Are these male/female differences, species differences or variation within the same species?
I hadn't even noticed there was a second grasshopper in the background! I think they're both Common Green Grasshopper, but the one with shorter wings is not full grown (although by August most of them usually are full-grown). Grasshopper nymphs look like small versions of the adults, but their wings develop more with each nymphal stage, becoming fully developed when adult.
Most grasshoppers are extremely variable in colour, and I don't think there is any particular significance to the colour differences between these two.
Entomologist and biological recorder
You may be surprised to hear that there are three grasshoppers in the photograph. Good camouflage. Thanks for the extra information.
So there are! No wonder I find it hard to catch grasshoppers, I obviously have a blind spot for them! You did well to get the photo of all three sitting still.
Lat/Lng: 51.0, -1.0
OS grid ref: SU7333