This weekend, I was working on the allotment and removed a lot of Fat-hen, which I checked for mines. I found tenanted mines of Chrysoesthia sexguttella (left) again and a vacated mine of Chrysoesthia drurella (below).
Chrysoesthia drurella is very under-recorded too. As both mines are around now, and the host is abundant everywhere, it would be a good time to do a bit of leafmine hunting and get yourself a new species or two.
More info on mines on Chenopodium album (Fat-hen) here: http://www.ukflymines.co.uk/Keys/CHENOPODIUM.php