faults on skoda fabia 1.2 53reg - kazimodo
Any advice would be appreciated. On acceleration, when the clutch is depressed my revs go up as if riding the clutch but I'm not. It's been in the garage twice now and they've checked it over but keep saying that they can't find anything wrong. It doesn't happen every single journey but almost and it's getting worse. Has this happened to anyone else.
faults on skoda fabia 1.2 53reg - Lud
Clutch is worn out or contaminated with oil or grease I wd think.

You say 'when the clutch is depressed revs go up as if riding the clutch but I'm not'. What is 'depressing' the clutch if not another word for 'riding' it? There seems to be a contradiction in yr post.
faults on skoda fabia 1.2 53reg - Hamsafar
I think you mean not depressed?
If so, the clutch must be slipping, maybe the clutch plate splined hub is not sliding freely on the shaft which it is mounted on, or as already said, it is oily or worn. Either way a new one would be required.
Are there any funny noises, or notchy feel in the pedal travel? sometimes bearing tabs can break making the pressure uneven causing binding.