Leafmines on Smooth Sow-thistle
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I agree with your ID Steve and I realise that the .authorities prefer 'atricornis' but the quote marks flaw the ID panel
Before posting my own I visited every post of Chromatomyia 'atricornis' to see if I could learn more - I did. But like every good iSpotter I have returned to agree where possible.
So why not look at mine http://www.ispotnature.org/node/740413
Lat/Lng: 51.329907748892, -0.75174808502197
OS grid ref: SU870597