s 20 Government ship
20.—(1) Subject to subsection (3), nothing in this Act applies in relation to —(a) any warship; or (b) any ship for the time being used by the government of any State otherwise than for commercial purposes. (2) Section 15 does not apply to a ship that is owned by a State Party if there is carried on board the ship a certificate issued by the State Party stating —(a) that the ship is owned by the State Party; and (b) that any liability under section 10 will be met up to the limit prescribed by section 12. (3) Subject to subsection (2), Part 4 applies to a ship mentioned in subsection (1)(a) or (b) if specified in a notice under paragraph 3 of Article 4 of the Convention.