I collected a tenanted leaf with c100 mines from an infested horse chestnut at Loughborough on 21/06/2008, and managed to rear the them through to a mass emergence on 02/07/2008. I've done this before but never managed to get a shot of the adults for one reason or another, but this year I at least got something recognisable:
Horse Chestnut Leaf-miner
This is a rapidly spreading recent colonist that is a major pest of horse chestnut (so in reality an alien species attacking an introduced species - poetic justice?). There is a load of info. here about this moth.
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