I have a list of these now..not that it helps me much. Come on NICEIC! And, you guessed it.. Checkatrade. This one was incorporated in 2012, so five years trading to learn to get it right.
The householder said "The electrician was confused about the earthing rod".
Property "earthed" through bonding and neighbour's PME. (I actually get 0.15 which isn't bad disregarding that minor detail). Confusion was clear because the field had been "Tippexed" a couple of times.
Ra to the rod is 650 Ohms.
DNO visiting to provide (hopefully) a MET soon.
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