OK, I have a suspension knock on my C2 VTS 2009. Car is very low mileage 28k, passed recent MOT no advisories. Knock at very low speeds on bumpy, uneven surfaces (the road where I live is very poor). Knock appears to be from O/S but that's the side I sit! Both front springs replaced at different times and recent drop links. Car handles well, no vibration from steering, transmission or braking.