Zs too high

I have a Ze reading of 0.35 on a TNCS system and I've had the DNO out to check and they say its ok.

From my main board I have 2x 10mm sub mains feeding another board and my Zs on the cables is ~0.45 ohms. Max allowed according to BS7671 is 0.35 ohms. What can I do in this instance as the high Zs is caused by the high Ze which the DNO has okayed.

Thanks for the input.

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