From and after the setting apart or placing under charge, or purchase, and conveyance, grant or demise thereof, all other messuages, buildings, castles, forts, lines, or other fortifications, manors, lands, tenements, and hereditaments, which shall at any time or times hereafter be set apart for the use and service or placed under the charge of the ordnance or late barrack department, or which shall be hereafter set apart for or placed under the charge of any person or persons acting under the authority of or in trust for Her Majesty or Her royal predecessors, for the use and service of the said departments, or for military defences, or which shall be hereafter held, used, or occupied, or purchased, vested, or taken by or in the name of or by any person or persons in trust for Her Majesty or Her royal predecessors for the use and service of the said departments, or for the defence and security of the realm; and all erections and buildings which shall then or which may thereafter be erected and built thereon, with the rights, members, easements, and appurtenances to the same respectively belonging, shall be and become and remain and continue vested in the principal officers of Her Majesty’s ordnance for the time being, and their successors in the said office, according to the nature and quality of and the respective estates and interests in such messuages, buildings, castles, forts, lines, or other fortifications, manors, lands, tenements, and hereditaments, in trust for Her Majesty for the service of the said ordnance department, or for such other public service or services as Her said Majesty shall from time to time, by any order in council, be pleased to direct.