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Ok an explanation for Peter. L. thompsoni is supposed to be a parasitoid on Ostrinia nubilalis, the corn stemboring Micro. However, it has also been bred from Nonagria and other stemboring Noctuidae in based on bred material and habitats in Netherlands, I'd say with us Nonagria is the primary host. So it you have reed, you can have Nonagria.
I'd never realized that thompsoni would be new to the UK. As said, it is a tough call, so let me explain
* arista not largely thickened, so no grisescens
* third antennal segment long (2.5 - 3 x second)
* bend of vein M only slightly further from wing margin than from crossvein m-cu
* profile of face should be completely convex, and though the angle is not dead straight, so it seems in the last pic.

I think more pics are not helping (me), I would need to play with the specimen myself, of course, Tschorsnig can do it even better.


Theo