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Not even sure its a diptera.
I found it on the floor after taking photos of oak leaves (from milton keynes, uk) and acorns from the new forest, uk. So there are two possible locations where it could have got in among the foliage. It was taken last evening 20 oct 2006. the size was about 1cm.

actually when i did a preview there was no image shown even though the two images are 50k .jpg so appear to be well within the size limits