Disco Clutch?/Gearbox?

Hi,

Recently I have noticed my Disco's clutch slipping a little bit on steep hills, I thought I had a couple of months before I needed a new clutch but last night my wife called me to say she was stuck. The car seems to go into gear properly but it goes nowhere, does not seem to engage at all. Could my clutch burn out so completely in such a short time? or could the problem lie elsewhere?

Thanks

Peter