After much speculation, one of the capital's most elusive artists, previously known only by a single-word moniker and a distinctive body of work. has emerged from the murk to reveal his name and face. Banksy? Not him. We're talking about dubstep artist Burial, hotly-tipped for this year's Mercury prize and a man whose shuddering bass and industrial squawks have scored many a sojourn through nighttime London's bitter streets. Having long shunned the limelight, Burial......