Somewhat to my surprise, my volunteer squash has actually produced a couple of baby squashes. (It turns out that it's a butternut squash. Hurrah!) But as we head conclusively into autumn, there isn't enough warm weather left for them to grow to a decent size, let alone to ripen.
Apparently you can use unripe winter squashes (like butternut) in much the same way you use summer squashes (like courgettes), so I anticipate experimenting with Butternut Courgette in the near future. I'd still like them to get a little bigger first, though, so I raided the pile of bamboo poles, and the big stash of bubble-wrap in the garage, to construct an Emergency Squash Cloche:
I'm not sure if it'll work, but it was free and took only 15 or 20 minutes to set up and tie together. It's not a good long-term cloche, either, as it's hard to get in under it, but it'll do for the next couple of weeks to see what happens. My main problem at this point is preventing Leon from pulling it down in order to pop all the bubbles.