The Lord Chancellor may from Time to Time fix a Scale of Fees to be paid to the Examiners of Title, and also of Costs to be paid to Solicitors or certificated Conveyancers, in respect of any Service rendered by them in any Matter relating to Proceedings under this Act; and he may from Time to Time alter any such Scale when fixed, and any Scale of Costs so fixed may, if the Lord Chancellor thinks fit, be based on an ad valorem Principle.