I had that annoying click in my -99 4/4. Spent quite a lot of time trying to locate it. Finally I could actually feel it when depressing the clutch pedal and using the other hand as 'detector'. It turned out to be the push rod somehow being worn slightly. I took it out and rotated it 180 degrees and the click was gone.
-99 4/4, 1.8 Zetec, Indigo Blue, 2-seat, Suplex RS
-04 Citroen Pluriel, 1.6 Sensodrive, Met Orange
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