It's Grime Up North (2011)

Charlie Sloth has been on a road trip to find the hottest rappers up North and try to understand why rap music in the U.K is dominated by the London scene. He's travelled from Newcastle to Liverpool, Manchester to Sheffield, Huddersfield to Leeds; spent time in boxing gyms with aspiring MCs, and met feared battle-rappers working the night-shift in Morrisons. Featuring Shotty Horroh, Bang On, Tez Kidd, Hoodman, The Projekt and Sermstyle.

Unfortunately the movie It's Grime Up North is not yet available on HBO Max.