Stormzy has just let a big shot go with his latest freestyle, "Shut Up." XTC's seminal "Functions On The Low" production gets a good lacing as the grime star calls Chip to war (?), responds to those "back-up dancer" tweets surrounding his appearance at The Brits, and makes sure that we all know one thing: he's still the best in grime. Watch Big Mikey in full swing up above.