We installed and tuned it after he'd gone and it's working like a charm. But Arthur doesn't want me to reveal what it actually does until we've installed the soundchip we ordered yesterday. So it will remain secret for a while.
I also think I've roped Tom in to help with one of our other ideas which requires a bit of delighting with data, and means I'm looking for old maps of our area. That's going to be exciting too. We're going to need a bigger arduino.