leenowell wrote:

Looking at the wiki it looks like it is tn C's.
The incoming wire goes to a fused black box and outbof that comes over neutral and earth.

You're *probably* correct, though depending what connections are made
inside the black box (cutout) it could be TNC-S or TN-S, as some of the
photos show (those with/without links from N to E inside the box).

Earth goes to cu and the live and neutral go to the meter and then
to the cu via a new isolation switch.