4.—(1) A fishing vessel is subject to the following surveys—
(a)before a Work in Fishing Convention Certificate is first issued, an initial survey by a certifying authority, as set out in Merchant Shipping Notice 1885 (F);
(b)thereafter, at specified in intervals, a renewal survey by a certifying authority, as set out in Merchant Shipping Notice 1885 (F).
(2) A renewal survey must be completed—
(a)if the length of the fishing vessel is 24 metres or more, within four years of the initial survey;
(b)if the length of the fishing vessel is less than 24 metres, within five years of the initial survey.
(3) A fishing vessel which does not fall within paragraph (2) is subject to a survey by a certifying authority as set out in Merchant Shipping Notice 1885 (F).