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From your photos, there is a piece of foam lagging around the pipework to the vessel, just before the pipe clip that attaches it to the underneath of the shelf battens... I'd say that's been put that on there to try and stop the noise you're hearing. I'd get someone to open a tap at the time the noise occurs, while you stand there with your fingers on that section and see if you can feel the vibration. Then try something heavy on the shelf to see if that prevents the noise.