Had the same, and replaced with with new genuine bottle. Little overall cost difference.
Usual fault is the float, not so often the sensor
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*While I am not a "genuine fanboy" for parts in general, when it comes to the cooling system (including serpentine belts) I typically always use genuine OR the original equipment manufacturer if available (which in itself can take a bit of research in finding out who made it for Land Rover.
*often the after market parts such as coolant hoses, turbo intercooler hoses dont come with hose clamps nor do they fit as good.