HC Deb 26 May 1971 vol 818 c167W
Mr. Luce

asked the Chancellor of the Exchequer whether he will propose changes in duty to encourage high mileage operators to convert vehicles to the use of liquefied petroleum gas in place of petrol, in order to make a contribution towards the reduction of pollution.

Mr. Higgins

No. The case for such an incentive has not been made out.