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Time it takes to trip. C type MCB will take currents over it's rating for longer than a B type will. Ideal when used on devices that have high inrush currents.

AFAIK (though I may be wrong), you shouldn't join any main/supplementary earthing conductors. Ideally you'd run a new cable and and test the Ze, which unless you have some pretty expensive equipment you're not able to do. With it being a TT, if I were you I'd run a new cable out myself & call...

You fit into the "pay your local council £200 to have it inspected & tested" category. Either that or DIY and don't notify it (make sure you test the whole thing though). But you won't get much support for doing that on here.