3U.K.For section 39 substitute—
(1)This section applies if the Commissioners consider that, having regard to difficulties encountered or expected to be encountered by any registered operator in obtaining and recording information about passengers and their journeys, it is appropriate for this Chapter to have effect in relation to the registered operator in accordance with a special accounting scheme.
(2)The Commissioners may agree with the registered operator that this Chapter is to have effect in relation to the registered operator in accordance with a special accounting scheme agreed between the Commissioners and the registered operator (but subject to subsection (4)).
(3)A special accounting scheme is a scheme which makes provision for methods of calculating—
(a)how many persons are to be regarded for the purposes of this Chapter as chargeable passengers carried by chargeable aircraft operated by a registered operator, and
(b)how many of those are to be so regarded as having been so carried on journeys in respect of which duty is chargeable at any particular rate.
(4)The Commissioners may publish a notice specifying terms and conditions subject to which special accounting schemes are to have effect.
(5)Where the Commissioners and a registered operator have agreed that this Chapter is to have effect in relation to the registered operator in accordance with a special accounting scheme, this Chapter has effect in relation to the registered operator in accordance with the scheme (and with any notice under subsection (4) which has been published by the Commissioners and not withdrawn) for the period agreed by the Commissioners and the registered operator.
(6)The Commissioners and the registered operator may at any time agree to vary the special accounting scheme for the future.
(7)The Commissioners may at any time terminate the operation of the special accounting scheme—
(a)on the application of the registered operator, or
(b)where they have reasonable grounds for doing so,
by giving notice to the registered operator.”