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And the key here is if you can’t get 20ohms - which you won’t with an normal earth rod in majority of cases, then don’t install one .
Remember the regs are a guide not statutory .
What would you class as a 'normal' earth rod?
I have installed many earth electrodes, made up of multiple standard rods, with Ra of less than 20 ohms.
Plus of course there are the many lightning protection installations which use standard rods to achieve even lower values.
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Our favourite word "reccomend" makes an appearance.....
I think that has changed, it now states supplementary equipotential bonding whereas I am sure it used to just say equipotential bonding.
To my mind this possibly moves the intended point of connection of the earth electrode to be local to the swimming pool or other basin.