Evening, all. Am finding this tough going, although making steady progress.
I am however a little confused that the preamble suggests a symmetrical grid, yet by my reckoning the Down clues start at 'Leave mark...', and appear not to exhibit any symmetricality.
Is this because of thematic treatment ?
I'm not looking for an answer to a clue, so hope that this Q is in keeping with the objective and spirit of this thread. Thank you!