Thank you for confirming that one, hamishsoup - I have to say it was still niggling me, even after all of this time (and I'd got to quite like the alternative, fully vocal, possibility).
I enjoyed the blog on the 15squared site but I no longer contribute anything there, so I'll take this opportunity to thank you for a very enjoyable puzzle. I'm surprised you haven't taken more credit for the clever ambiguities throughout the puzzle - it seemed, to me, to be a very carefully tailor-made affair (I think you might be being too modest).