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Even with a high quality picture I would be hesitant. ;) Most species in Disney's key(s) are illustrated in left view (some both) and from dissected genitalia on microscope slide. I feel that in some species that may have influenced the way the genitalia are shown (some distortion because of pressure of the cover glass). And keep in mind: There are many additions to Disney's British key and 'continental species' that will not be included anyway.
This specimen looks similar to numerous specimens I have from the ENCI Malaise trap and that I have not yet identified (and probably will not do myself either).