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taken in Richmond Park, SW London in November
IMG_4936 fly by tobyjug5, on Flickr

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It's an encyrtid wasp - probably Microterys nietneri

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That's the ID I had but someone suggested it was not on the British list.

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I believe there are a dozen species of Microterys on the British list, not including nietneri, but I don't have a key to separate them. It's worth pointing out that nietneri is sold as a biological control agent (against soft scale) in Holland, and has almost certainly been bought and released in this country, so it will be on the British list soon!

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Interesting, maybe it came over with some plants for the more exotic plantation in the middle of Richmond Park.