. Richard Cowie Jr is the 38-year-old from Bow, east London, who, as Wiley, is the pioneering force of grime, the most revolutionary musical movement in Britain since punk. He also has a reputation for an artistic temperament. In 2013, Wiley flew in to Heathrow from his home at the time in Cyprus for a booking at the Glastonbury Festival, took one look at the rain on the tarmac, tweeted, “F*** them and their farm,” and headed into London. He has had a long-standing beef with Dizzee Rascal, aka Dylan Mills, his former protégé, which escalated a few weeks ago when the latter threatened to…