I have seen the farrier come and go a number of times. I've inspected his work and chewed his tool box, but this time he headed purposefully towards me carrying a large metal implement. It turns out that this is for scraping your hoof. The actual hoof scraping didn't hurt at all, but I did a bit of wriggling anyway, just to show that I am not a push over.
In the end my feet had been filed into a nice shape. Apparently this is a kind of beauty treatment that I am to have every month to make sure that my toes stay in tip top condition.