4.—(1) The Secretary of State may grant exemption from some or all of the requirements of these Regulations (other than regulation 11 and Schedule 1) for—
(a)vessels, tugs, pushers and floating equipment operating on waterways in the United Kingdom not linked by inland waterway to the waterways of a member State other than the United Kingdom,
(b)vessels having a dead weight not exceeding 350 tonnes or vessels not intended for the carriage of goods and having a water displacement of less than 100m3, which were laid down before 1st January 1950 and operate exclusively on waterways in the United Kingdom.
(2) An exemption granted in accordance with paragraph (1) may be given on such terms (if any) as the Secretary of State may specify.
(3) The Secretary of State may, subject to giving reasonable notice, alter or cancel any such exemption.