TN-C-C

I spy with my little eye - some basic insulation in the meter tails. (The wrap of "L" tapes does not count.)

The insulated and sheathed tails are oversleeved where they go into the meter.

Ah! I see. Thank you.

Well the wiring on the DNO side of  that thing is (clearly!) TNC, maybe  with multiple NE interconnections (probably electrodes) ahead of it.

Anything downstream of that G/Y will be TNCC-s, which for our purposes is handled as  plain TNC-s.

As opposed to a DNO network with TNSCS or something where a former TNS supply has been patched in the middle with a section of combined neutral and earth at the joints.

I'm not sure if its a typo or they are really being more descriptive of their upstream network.
My money is perhaps more on a typo. 
Note that internal DNO speak often refers to CNE (combined neutral earth) and SNE (separated neutral and earth) rather than using the TN-x format that the international standards and BSI adopt. 
Mike.

Well the wiring on the DNO side of  that thing is (clearly!) TNC, maybe  with multiple NE interconnections (probably electrodes) ahead of it.

Anything downstream of that G/Y will be TNCC-s, which for our purposes is handled as  plain TNC-s.

As opposed to a DNO network with TNSCS or something where a former TNS supply has been patched in the middle with a section of combined neutral and earth at the joints.

I'm not sure if its a typo or they are really being more descriptive of their upstream network.
My money is perhaps more on a typo. 
Note that internal DNO speak often refers to CNE (combined neutral earth) and SNE (separated neutral and earth) rather than using the TN-x format that the international standards and BSI adopt. 
Mike.