how to fix Renault Espace 2.2 dt 1998 clutch?

the clutch on my Renault Espace 2.2 dt had felt abit stiff since brought it 3 weeks ago, but put it down to size of it. has drove fine alittle slack on steep hills & small oil drips on &off, took short drive to shop & started fine put into 1st to pull away & clutch pedal hit the floor & no longer returns, didnt feel like a snap but as if foot slipped off pedal. anybody help PLEASE :S