Any person who save for just and sufficient cause interferes in any way with any ship, aircraft, vehicle, buoy, anchor, chain, rope or mark which is being used for the purposes of any functions of the Commissioners under Parts III to VII of this Act shall be liable on summary conviction to a penalty of F1level 1 on the standard scale.

Any person who fires upon any vessel, aircraft or vehicle in the service of Her Majesty while that vessel, aircraft or vehicle is engaged in the prevention of smuggling shall be liable on conviction on indictment to imprisonment for a term not exceeding 5 years.