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CSA of main earthing conductor for TT

Grumpy
Morning! Has the minimum CSA of the main earth to the rod changed in the 18th ed? I can't find any reference to it in the BBB (except when buried). 

I have a guy who is insisting on 16mm whereas I "thought" it could be much less if not buried and protected against corrosion and mechanical damage. I only have table 4.4(ii) in my 17th ed OSG as corroboration. Thanks.
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    Are you sure about that Andy?

    However, my original post has been answered, thank you all. It is unsettling that the inspector assumed that the earth was 6mm, either there was an earth connection that could be measured or there wasn't (isn't that aC1?) and then that is compounded by asserting that it should be 16mm when that simply is not the case. And this wasn't a fifty quid drive by either. Far from it!
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    Are you sure about that Andy?

    However, my original post has been answered, thank you all. It is unsettling that the inspector assumed that the earth was 6mm, either there was an earth connection that could be measured or there wasn't (isn't that aC1?) and then that is compounded by asserting that it should be 16mm when that simply is not the case. And this wasn't a fifty quid drive by either. Far from it!
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