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The MOT test doesn't involve the clutch, so no need to worry as far as that's concerned. I have the opposite symptom on my Mk.5b diesel estate - something is a bit noisy when the engine is idling in neutral with the clutch engaged (clutch pedal up) but when I disengage the clutch (clutch pedal down) the noise stops. I've never had to work on the Escort clutch though so I don't know much about it.