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Ok, fair enough. It has however occured to me that in a "non PME" area, it only takes one household to have an un-noticed neutral-earth fault on the consumer side (and I've come across a fair few N-E in even my limited experience on the non RCD side of split loaders) to create their own "TN-C-C (and I suppose also to all those connected to the same main, all via his RFC CPC !!
It just brings into question the validity of a given earthing system....
Any takers ? PME seems to be topic of the moment, but the DNO's seem very slack over the whole issue. Is this because they are unprofessional or doesn't it actually matter (I'm being deliberately provocative here)