Is the knocking sound engine related? E.g does it happen as you accelerator or when you are using the accelerator? I only ask as quite a common issue with A2's is the EGR value (gas recirculation valve) that starts to make a knocking noise from the engine bay when using the accelerator. You can almost control it with the accelerater as you accelerate in the car.
If the symptoms are similar then its a dealer job, and from experience its a real b*gger to fix.
On the positive side its is not doing your car any harm.
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