About 10mm long. Attracted to MV light trap. The markings look very distinctive but I can't track it down.
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That's why I couldn't find it - it's not in Chris Manley. Only a few days to go for Richard Lewington's micros book!
It's really good, quite a bit missing from it, so care should be taken. Better than anything else by far though.
I'm looking forward to it. And thanks for the id!!
I should have said it's 7mm long (not 10mm).
Lat/Lng: 51.41226, -1.25512
OS grid ref: SU519684