While I got a few Sepember Thorns in my first few years of trapping it's been only Dusky Thorn since. It's now by much the commonest of all the Thorns.
This one though I think is a September Thorn again?
Re the micro, not a great photo but I'm thinking Clavigesta purdeyi? Although it's not clear the head is grey rather than orange.
Mark Griffiths, Garsington, Oxford.