Jay-Z knows a moneymaker when he hears one. With the basement stomp and scronk of the UK’s garage/grime rap scene beginning to catch on stateside, one particular tomboy brought just enough approachable Sporty Spice hook to the movement to cut Def Jam a piece of the cake.

Lady Sovereign — bubbling over with cocky side-ponytails, bitten dirt-crescent nails and bad-mannered mic burps — has been leaking material for almost a year now, so the release of her first full-length rap playground is somewhat anti-climactic. But the mile-a-minute, wacked-out squeak-raps are packed manically tight, revealing a street rat with more than just a couple tricks up her sleeve. “I make up noise like pots and pans/ Dey should put my voice on an ice cream van/ Dat way da streets won’t be bland,” she spray-spits on “A Little Bit of Shhh.”

Rumors of American top-40 producers orchestrating the wily young Brit have fortunately proven false. Public Warning’s filed-down grime keeps some signature synth-blips and elephant bass — most courtesy of scene native Medasyn — while a dancehall clash not unlike M.I.A.’s pervades the beat, amplified by Sov’s overexaggerated, Jamaica-tilted British accent.

Her act is simple and marketable (not to mention a little irritating), resignedly little sister to the dirty twists and burns of garage kings like Kano and Wiley. But she’s got a devilish draw, and with a few exceptions, doesn’t turn out a bad rap either.

Lady Sovereign performs live at the House of Blues on Nov. 19.