Registry of Ships Act 1787

When a vessel is sold by on subject to another the certificate of the registry must be recited in the bill of sale, or it shall be void.

XX. And be it further enacted, That when and so often as the property in any ship or vessel belonging to any of his Majesty’s subjects shall be transferred to any other or others of his Majesty’s subjects in the whole, or in part, the certificate of the registry of such ship or vessel shall be truly and accurately recited in words at length in the bill, or other instrument of sale thereof, and that otherwise such bill of sale, or other instrument of sale shall be utterly null and void to all intents and purposes.