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Thanks for the ID
Really, with a fly like this one, you now need to be differentiating between pedissequum and stackelbergi, rather than citrofasciatum (though you obviously have to eliminate that first!).
Have a look at Jeremy's pics...
My Flickr photos...
Thanks for that Ian. Wasn't really familiar with stackelbergi.
Looking at the photos, I believe this is pedissequum, as the smudge spreading from the stigma is larger, going beyond R2+3. (I don't think any other diagnostic features are visible in this photo).
Lat/Lng: 52.2, 0.1
OS grid ref: TL4660