4. After regulation 4(2), there shall be inserted the following—
“(2A) Subject to paragraph (2B), these Regulations do not apply to ships, other than United Kingdom ships, which are owned or operated by a Contracting Government and used only on government non-commercial service.
(2B) The requirement in regulation 5, so far as it relates to paragraph 2.4 of regulation 19 in Chapter V, shall apply to ships which are owned or operated by a Contracting Government and used only on government non-commercial service.”.