2003 Vauxhall Vectra

My car is regularly serviced at the same Vauxhall dealer since I purchased it in September 2004. The last service was in August 07 when I had an MOT test. The milage then was 59593 miles & the next service should be @ 70000 miles.

I started suferring severe lost of power last week such as the cruise control disengaging travelling uphill, Engine over revving etc, I requested a diognostics from another garege. Their conclusions are that my clutch is worn out. Most of the millage I did was on main trunk roads & motorways so how can a clutch fail at so low milages especially as I am certain I do not ride the clutch?