As above, likely to be the rear arm bush IMHO. If it is this, then it WON'T cause wandering or any discernable steering effect, but will make a knocking noise over bumps much as you describe.
I can point you to some pictures and a write up of when I replaced mine, if you want.
On mine I could tell it was knackered by looking at it carefully and comparing to the other side (which is fine, so I only did one side).
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