The noise was relentless: a monotone droning that seemed like it might never end. In the stands, they blew their horns with vigour and enthusiasm, unconcerned by those begging for it to stop. This was a celebration, of Africa, of South Africa, and the vuvuzela was an essential part of it. Whatever your view of this long, plastic horn – and most people who watched the 2010 World Cup at home, on...