Vauxhall Astra making a knocking noise

I own a diesel Vauxhall Astra (2005 model). When driving, the car judders as it pulls away and makes a knocking noise. The sound and judder stop when I push the clutch in. Any idea what could be wrong?

Asked on 16 October 2016 by Tony Glass

Answered by Honest John
Reads like a Dual Mass Flywheel problem, assuming this model was fitted with one.
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