Provided always, That no Purchase or Sale, except any Purchase or Sale where the Purchase Money shall not exceed One hundred Pounds, and no Exchange, Enfranchisement, or Grant, shall be made under the Powers of this Act without the previous Sanction and Approval of the Lord High Treasurer, or of the Commissioners of Her Majesty’s Treasury for the Time being, or some Two or more of them, to be signified by some Warrant under his or their Hand or Hands: Provided nevertheless, that such Sanction and Approval may be given either generally for any particular Class of Cases, or for any particular Purchase, Sale, Exchange, Enfranchisement, or Grant, and either with or without any Condition or Restriction, as to the said Lord High Treasurer or the Commissioners of Her Majesty’s Treasury for the Time being, or any Two of them, may seem meet.