As we were finding our way out a last museum room showed objects through the ages, a Latin document on vellum, a hunting gun, a tricycle and my personal favourite: boot warmers. I had thought they were to make boots kept in a cold porch preheated before wearing on a winter day, but in fact they were for drying out boots that had been worn by warming from the inside with a metal foot filled with hot water, a woollen cover helped absorb the moisture. It sounds great, yet in all the museums and antique shops where I have seen countless warming pans; ceramic hot water bottles; shoes and boots; boot or shoe stretchers; cobbler's lasts and shoe shapers, I have never seen a boot warmer.