PS I did thoroughly enjoy this week’s puzzle — many thanks Avian. I found it rather tricky, as I often rely on checked letters to help me get to answers, so the split clues and wandering letters left me a bit at sea, but I made steady progress and persevered, and when I got to the endgame the PDM was truly delightful, and the final pieces ingenious!
If I’m being picky, a few of the clues feel a little awkward. There are decidedly fuzzy definition matches in 12(LHS) and 14(RHS) I think, and in 19(LHS) the name of one ancient letter appears to clue another ancient letter — one with obvious similarities, but nevertheless a separate letter and I don’t think it’s quite enough to clue one with the other. Minor points, though, on the whole, and, hey, I got there (I think!).