I don't think the clutch is in the wrong way. If it is in the wrong way, it disengages freely, but makes an awful racket when you try to release the clutch.
If the hydraulic system is in order (clutch fork moves about an inch when you depress the pedal), then the clutch driven plate is most likely stuck to the flywheel.
The remedy is fairly brutal. You will need a long, clear driveway: warm the motor up first. Then, with the engine stopped, engage first gear, but keep the clutch pedal fully depressed. With foot off the accelerator, start the motor (and yes, the car will move). Once the car's moving at idle speed in first, keep the clutch pedal to the floor, give it a good squirt of throttle and then back off. Repeat the cycle as often as needed, until the clutch plate breaks free.
The alternative is a lot of work: drop the gearbox, unbolt the pressure plate, free the clutch, and reassemble.
Best of luck.
Rob
Doh!!
Sorry to revive an ancient thread but after a few attempts at bleeding an 'already bled' clutch system', Rob's driveway solution did the trick! Many thanks for all the helpful replies.