Electrical Safety for Small craft On-Board Guide

I've just purchased this guide.
I'm a little miffed that there doesn't seem to be any mention of a TT earthing system for shore supplies.
I quote " For a large percentage of UK small craft that have a permanent berth, especially those in marina locations, the majority of such berths will be serviced by a TN-S 230v AC single-phase shore supply."
Any marina or boatyard shore connection I've seen has always been on a TT system.
Explain away..

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