Does anyone know the species of this tiny green ichneumon?
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your tiny metallic green chalcid wasp is probably a species of Torymus, the species are impossible to identify without a preserved specimen and a high power microscope. It's a female because of the long ovipositor. Some species like this parasitise oak galls.
Lat/Lng: 51.8, 1.0
OS grid ref: TM1118