8In relation to a vehicle for which a licence was taken out before and is in force at the commencement of this Act, section 18 of this Act shall have effect as if—
(a)any reference to any rate of duty or amount payable under this Act included a reference to a rate of duty or an amount payable under the Vehicles (Excise) Act 1962;
(b)for any reference to duty paid in respect of a vehicle at a rate applicable under Schedule 4 to this Act, there were substituted a reference to duty paid at a rate applicable under Schedule 4 to the said Act of 1962.