LONDON (Reuters) - In a corner of north London, a new gleaming butchers is preparing to open.The only thing it lacks is meat. To coincide with Sunday’s World Vegan Day, Britain’s first permanent vegan butcher, Rudy’s, is opening, set to sell meat-free versions of traditional products such as baycon, soysage and turk’y. Demand for vegan products has surged in recent years in Britain, with increasing numbers of people cutting out animal-derived ingredients completely, while others reduce the amount of meat and dairy they consume each week.