Ford Focus C-Max Gearbox & Clutch Problems

Hi can anyone tell me if i can i get away with just changing the clutch plate on my ford focus it is not to bad at the moment but i think it is nearly ready. I have been quoted a lot of money for a complete assembly which to me sounds a bit...

The clutch pedal return spring broke today. I should be able to fit a new one myself, the only problem being is, as it has broken I can't see where it was mounted! Can anyone help with a pic or diagram, please.