Free Lush face mask (when you bring back 5 empty black pots)

Hiya
if you love Lush costmetics you will love this, if you bring back 5 rinsed black pots (the ones that dream cream, etc come in). they give you a pot of face mask that works for 4 masks.
Im not sure if this counts as a real freebie but if you love lush you'l love this

cheers