(1)Where by virtue of section 84A(2) of this Act a parking place has been designated under section 35 of this Act by a Minister, that Minister may make grants out of moneys provided by Parliament towards the cost of the provision and maintenance of off-street parking places, whether in the open or under cover, or for any purpose such as is mentioned in section 44(3)(d)(i) or (ii) of this Act, but in exercising his powers under this section shall use his best endeavours to secure that the aggregate of the amounts paid by him by way of grants does not exceed the difference between the aggregate of the sums received by him by way of charges made by him for vehicles left in parking places designated by him under the said section 35, and the aggregate of the expenses incurred by him in the provision, operation and maintenance of the parking places in respect of which those charges are made.