I’m no lover of rats. At various times I’ve shot, bludgeoned and poisoned them (Warfarin Creams work best: take a standard Bourbon biscuit and mix the poison with the chocolate filling). I’d certainly never dreamed of buying a rat, much less carrying one about in my pocket; but a few months ago I walked into a Crimean pet shop with just that in mind. I should explain. We – Dan the director, Larissa the fixer, the rest of the TV crew and I, the presenter – were in the port of Feodosia on the Black Sea, filming a series on Ibn Battutah for the BBC . . .