In this Act, unless the context otherwise requires, -
The expression "Commissioners" means Commissioners of Inland Revenue:
The expression "officer" means officer of Inland Revenue:
The expression "chief office" means chief office of Inland Revenue:
The expression "head offices" means the head offices of Inland Revenue in Edinburgh and Dublin:
The expression "duty" means any stamp duty for the time being chargeable by law:
The expression "material" includes every sort of material upon which words or figures can be expressed:
The expression "instrument" includes every written document:
The expression "die" includes any plate, type, tool, implement, apparatus, appliance, device, process and any other means whatsoever, used by or under the direction of the Commissioners for expressing or denoting any duty, or rate of duty or the fact that any duty or rate of duty or penalty has been paid or that an instrument is duly stamped or is not chargeable with any duty or for denoting any fee,