Crediting and debiting of carbon units to take into account domestic aviation emissions during 2018

4.—(1) If domestic aviation emissions in 2018 were—

(a) greater than the domestic aviation cap, an amount of carbon units equal to the difference is to be credited to the net UK carbon account in respect of 2018;

(b) less than the domestic aviation cap, an amount of carbon units equal to the difference is to be debited from the net UK carbon account in respect of 2018.

(2) In calculating domestic aviation emissions and the domestic aviation cap, the Secretary of State must use such data about aviation emissions as appear to the Secretary of State to be the best available data.