The averment that the Commissioners of Customs or Inland Revenue have directed or elected that any information or proceedings under the Customs Acts shall be instituted, or that any ship or boat is foreign or belonging wholly or in part to Her Majesty's subjects, or that any person detained or found on board any ship or boat liable to seizure is or is not a subject of Her Majesty, or that any goods thrown overboard, staved, or destroyed were so thrown overboard, staved, or destroyed to prevent seizure, or that any goods thrown overboard, staved, or destroyed during chase by any ship or boat in Her Majesty's service, or in the service of the Revenue, were so thrown overboard, staved, or destroyed to avoid seizure, or that any person is an officer of Customs or Excise, or that any person was employed for the prevention of smuggling, or that the offence was committed within the limits of any port, or where the offence is committed in any port of the United Kingdom, the naming of such port in any information or proceedings shall be deemed to be sufficient, unless the defendant in any such case shall prove to the contrary.