This is a very entertaining puzzle by my much more illustrious namesake.
It did take me a while to get going, which is often the way, but once I did, most of the answers fell into place.... most, that is! There are a few foreign words, names or expressions and, even though the wordplay is fair, I do foresee some furrowed brows!
I still haven't fully parsed 9a, and in 8d, even though the answer is clear, I'm, as yet, still unsure of what "discernible in this puzzle (with a single exception)" refers to. I'll keep at and hope for a PDM.
There was quite a lot of competition for my COD, 21 and 24a are both excellent, but it must go to 7d for a great clue with a lovely surface reading.
Thanks to Brendan for a most enjoyable crossword:-)