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Lovely photo! :)

Well, I have done a (little) bit of work with chalcids and it certainly looks like a Torymus sp. :D but they're a horrendously difficult genus to key out... I have the key and probably tried it twice before giving up! :@

Many of the torymids are parasitoids of galls - eg. T.nitens/auratus, which attacks the "Marble Gall" (Andricus kollari) found on Oaks.