I don't know if this would help anyone who is reading this, but I've just removed the clutch pedal, prior to changing the plastic piece and the metal clip. I did it, after reading all the above comments, and beg to differ as to the method recommended. I agree that the bolt holding the clutch pedal and spring to the pedal box has to come out, but it CAN be removed without either hacksawing the bolt or by removing the brake pedal. Might I suggest the following, some of which are obvious, but I'll state i anyway:
1/ Remove the covers from underneath the steering wheel; there are 2 of them; one's a soft carpet-like material near the pedals & the other's a plastic cover just in front of the ignition switch and wiper/indicator assembly covers. Their removal adds nothing to the job, but lets a bit more light on the situation!
2/ Lying on your back, with your head in the footwell, identify the long bolt that holds the clutch pedal in the pedal box, together with the return spring. The head of the bolt is facing the brake pedal & the nut is facing the middle of the car.
3/ Using a long 13 mm socket & a ratchet on the nut, together with a ring spanner on the bolt, loosen the nut and bolt. It is quite tight! Unscrew the nut and remove it.
4/ You will see that the bolt is free to move, but only up to the point where it collides with the brake pedal.
(now the clever bit...)
5/ Looking at the brake pedal that's blocking the removal of the bolt, there should be a small plastic clip on the driver's side of the pedal, which supports the wiring for the brake lights. Slide this wiring up towards the top of the car and it will come off the clip.
6/ This allows greater movement of the brake pedal towards the driver (i.e. NOT in the direction to apply the brakes) By moving the pedal towards the rear of the car the it will stop when it collides with the metal of the pedal box. When this point is reached move the brake pedal laterally (i.e. from right to left, as opposed to up and down)while continuing to push it towards the rear of the car and you'll find the pedal moves a little further to the rear of the car. This vital few mm is enough to permit the long bolt holding the clutch pedal in place to be slid out.
7/ Believe me, this works! It just takes a bit of fiddling! Once the bolt is out, put the brake light wiring back in place.
8/ As to putting the long bolt back, As has been stated earlier in this thread, put the bolt back the other way round, BUT put a nut onto the bolt and wind it up to the head of the bolt. Then slide the bolt into its housing, with the head towards the middle of the car (the other way round to that which it originally was) and place another nut on the end of the bolt. The reason for this is to prevent the end of the bolt protruding too far towards the brake pedal and fouling it.
9/ Tighten up both nuts, ensuring that the return spring is correctly seated and that the bolt does not foul the footbrake pedal.
10/ Put the kettle on, place bag in mug, remove milk from fridge and have a good cuppa!
Andrew Hutchings, June 2010