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Exactly - and even with your "30A", no ordinary domestic installation would have had anything approaching "between 3 and 6 x 1.2 meter rods".
In reality, it would probably take at least 45A or so to blow a 30A fuse ever (don't forget that even an 30A MCB would need around 34A for it ever to trip, and around 43.5A to trip in 1 hour) - so the earth rod would have to be around 5Ω or less - I would think essentially unknown in an ordinary domestic installation.
I think the majority of domestic TT electrodes are, like mine, around 50Ω under wet conditions, higher during 'droughts'.
Kind Regards, John
5 ohms is impossible. The TT electrode at the transformer end is part of the path and never that low.