Front suspension.
Knocking noises when driving slowly over bumps.
I love the car to bits, it looks sexy and sounds nice... never ever thought I would buy a Fiesta after they designed the Mk4.
The knocking noise you mention could be the jack which is located in the boot. Wrap it in a cloth then put it back, it should stop.
The Ford jack is actually kept under the bonnet in a black plastic box.
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