Paragraph 1
In this Schedule, the expression—
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“external wall”, in relation to any room, means a wall which forms part of the outside of the building in which the room is situated;
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“party wall”, in relation to any room, means a wall dividing the premises in which the room is situated from other premises under different occupation;
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“the Standard of 1963” means the British Standard Specification for Thief Resistant Locks for Hinged Doors B.S. 3621: 1963, as a published on 6th May 1963;
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“two-leaf door” means a door having two leaves which either close on to each other or on to a central pillar, and the two leaves of any such door shall be treated for the purposes of this Schedule as a single door;
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“sheet steel” means mild steel sheet being not lighter than 16 gauge.