(1) Subject to subsections (2) and (3), heavy oil which has been taxed at the rate specified in Schedule 2 for other heavy oil (referred to in this section as "marked gas oil") may be used for private pleasure navigation up to and including 31 December 2019.

(2) Where subsection (1) applies, the owner of the craft used for private pleasure navigation shall, not later than the first day of March following the calendar year in which the marked gas oil was purchased for such use, deliver to an officer -

(a) a return, in such form as the Commissioners may require, of the quantity in litres of marked gas oil purchased in that calendar year, and

(b) payment of an amount of mineral oil tax on such quantity, calculated at a rate that is the difference between the rate specified in Schedule 2 for marked gas oil and the rate so specified for heavy oil used for private pleasure navigation.