Sound the trumpets. Let rip the Byzantine chorus of clattering bells and gongs, the thunder of cannons, drums and flashing Greek fire. Raid cellars and let champagne corks fly. Eighty years after Patrick Leigh Fermor’s epic trudge across Europe, 20 years after the death of his long-suffering publisher Jock Murray, ten years after the passing of his wife Joan, and two years after his own death, the elusive third volume that so tormented him is published at last.