20U.K.In section 30 (rate of duty) before subsection (5) insert—
“(4E)In relation to the carriage of a chargeable passenger on an aircraft to which subsection (4F) applies—
(a)if the rate which (apart from this subsection) would apply is the rate in subsection (2)(a) or (b), a rate equal to twice the rate in subsection (2)(b) is to apply instead,
(b)if the rate which (apart from this subsection) would apply is the rate in subsection (3)(a) or (b), a rate equal to twice the rate in subsection (3)(b) is to apply instead,
(c)if the rate which (apart from this subsection) would apply is the rate in subsection (4)(a) or (b), a rate equal to twice the rate in subsection (4)(b) is to apply instead, and
(d)if the rate which (apart from this subsection) would apply is the rate in subsection (4A)(a) or (b), a rate equal to twice the rate in subsection (4A)(b) is to apply instead.
(4F)This subsection applies to an aircraft if—
(a)its authorised take-off weight is not less than 20 tonnes, but
(b)it is not authorised to seat more than 18 persons (excluding members of the flight crew and cabin attendants).
(4G)In subsection (4F)(a) “take-off weight” is to be read in accordance with section 29(2) but as if “20” were substituted for “ 5.7 ” wherever occurring.
(4H)For the purposes of subsection (4F)(b) an aircraft is authorised to seat more than 18 persons (excluding members of the flight crew and cabin attendants) if—
(a)there is a certificate of airworthiness (as defined in section 29(4)) in force in respect of the aircraft showing that the maximum number of persons who may be seated on the aircraft (excluding members of the flight crew and cabin attendants) is more than 18, or
(b)the Commissioners are satisfied that the aircraft is designed or adapted to seat more than 18 persons (excluding members of the flight crew and cabin attendants) or the aircraft belongs to a class or description of aircraft in respect of which the Commissioners are so satisfied.”