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Many thanks Reinoud. I can't find records of C. femorata in the UK and think it may only be on mainland Europe, so this is likely C. marginata if our recording is accurate. I found this good key to German Asilids http://www.robberflies.info/keyger/htmle/keychoerades.html which gives the key antennal differences, though my photos don't show the antennae clearly enough.