Bush-cricket 10mm nymph ID help please

Hi all,

on a visit to a small patch of limestone grassland near Chilmark in SW Wilts on Saturday [24th May2014], I saw several small green bush-cricket nymphs. I'm guessing, due to the speckling on legs and, to a lesser degree, on the abdomen this is likely to be a Speckled Bush-cricket? But is there an outside chance it could be Great Green Bush-cricket?

Image attached.

TIA,

Steve.