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Do a pfc and a pscc . If they are the same result it's probablY be TNCS . However as others have said it's probably not.
Thank you.
0.8 ohms is the typical value for TN-S, though some would say the ‘typical maximum’.
Anything below 0.8 ohms is acceptable, above would be a concern.
That earthing block does not look connected to the neutral.
If it is, then it is likely that the DNO have converted it to TN-C-S.
Not sure if that’s two supply cables, or a looped supply.
100A main fuse suggests a looped supply.
Although the supply may be TN-S, network upgrades may mean PME conditions may apply.
Thank you, great advice.