Just to update this. Car spent the last few days at the dealer. Frustratingly, it refused to make any sort of noise or rattle each time they started it. No errors or faults showing when they ran a diagnostic either.
Not much else they can do so hopefully it was a temporary glitch and all will be well in the future.
Not much else they can do so hopefully it was a temporary glitch and all will be well in the future.
