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I would agree Jon although the excuse for switch from galvanising may have some credence given the tin foil thickness of chassis material.

Electrophoretic coating is far from perfect on later Morgan trad chassis though particularly close to bracing points. I regularly find tell tale signs of incipient rust in such nooks and crannies despite the process claims. Fortunately these show up well against the black underseal and get treated with aerosol applied black waxoil/underseal which does creep into where it's needed.