In celebration of Saturday’s 4/20 (no, I don't mean this year's Record Store Day… look it up), the aptly named Piff Gang have released a teaser mixtape - PG13.

The thirteen track compilation, which comes in at just under an hour, is a selection of material that hasn't quite made it to the final cut of the London hip-hop collective's forthcoming follow-up to 'GreenHouse'.

Mixed by DJ Motive, produced by the likes of Crankz, The Purist and Brandun Deshay, and featuring Mayhem SAS, 'PG13' is available as free download here.