# Merchant Shipping (Registration, etc.) Act 1993 (repealed 1.1.1996), Paragraph 4

Extent: E+W+S+N.I.

(1) Subject to sub-paragraph (2) below, a British ship, other than a fishing vessel, shall hoist the red ensign or other proper national colours—
(a) on a signal being made to the ship by one of Her Majesty’s ships (including any ship under the command of a commissioned naval officer); and
(b) on entering or leaving any foreign port; and
(c) in the case of ships of 50 or more tons gross tonnage, on entering or leaving any British port.
(2) Sub-paragraph (1)(c) above does not apply to a small ship (as defined in paragraph 1(2) above) registered under this Act.
(3) In this paragraph “commissioned naval officer” has the same meaning as in paragraph 3 above.

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Source: https://www.legislation.gov.uk/ukpga/1993/22/schedule/3/paragraph/4 (the official version)
Page: https://openlegislation.uk/merchant-shipping-registration-etc-act-1993-repealed-111996/schedule-3/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.