This one pretty much speaks for itself.

Scrufizzer's (fka Scruface) reputation for having one of the fastest — if not the fastest — flow in UK music is pretty much a given at this point. Over the years he's laced instrumentals from the worlds of grime, UK garage, bassline, house music and just about every other type of bass-focused music going.

Here is way back in 2010, proving that you can practice all you like, but some things just can't be taught. Also, pay close attention to his diction. There are plenty of fast-talking MCs, but none who speak as clearly as Scrufizzer.