i bet you'll find the rubber bung/stopper is missing from the top of the clutch pedal
it was on mine
take of the underside part of the dash, its just 4 screws
then you'll see the tops of the pedal box, if there is a hole at the top of yours then the stopper is missing
to cure this i went to b&q an got a long bolt, 2xnuts
put one nut on about half way down
invert the bolt, so that the bolt head is against the clutch pedal and the nut you put on is against the back of the hole
then put the nut on the otherside of the hole and adjust accordingly until it is level with the brake pedal
once this is complete you adjust the clutch
you invert the adjuster under the bonnet