To Edinburgh to get married, but first my toyboy groom John Playfair (he’s a mere 69) shows me the city of his birth, which is peppered with his kinsman William Playfair’s neoclassical buildings. Outside the Chambers Museum there is a new, magnificent statue of him by Stoddard. We climb Calton Hill to admire the monument to another Playfair, this time the mathematician and astronomer John, and also his observatory, both built by W.H.