I think it will be better disconnected and removed, otherwise it will need to be connected with an adequate sized conductor to the DNO spec. 2nd opinion would be nice .
Someone told me once that there is some iee guidence that advises an earth electrode on a TNC-S earthed installation... helps with the 'M' in 'PME' you see...
As plug says, make sure the cable to it is of a reasonable size
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