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Common Green Grasshopper can look similar to Common Field, they both have angled keels on top of the pronotum, but Common Green doesn't normally have red on its abdomen. Also, you can just about see a bulge along the costa (front edge) of the wing, and although the angle of the photo doesn't show it well there is a hint of the densely hairy underside, both of which are features for Common Field but not Common Green.
Entomologist and biological recorder
Lat/Lng: 51.3, -3.3
OS grid ref: ST1067