I know the original poster nrobinson had removed the rear parking brake, but in my case of a metallic clank on the nearside rear every time I drove over a small bump it was the rear parking brake mechanism, its shoes or the cable banging around.
Inside the car its sounded like something badly broken such as a spring, shocks, loose towbar, etc.
Thankfully mine is now fixed and as a bonus the parking brake works again ..... well hopefully until the MOT in November.....?
Best of luck with yours
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