The Channel Tunnel (International Arrangements) Order 1993

(2) Otherwise for the purposes of this Protocol the expression:

(a) “frontier controls” means police, immigration, customs, health, veterinary and phytosanitary, consumer protection, and transport and road traffic controls, as well as any other controls provided for in national or European Community laws and regulations;

(b) “host State” means the State in whose territory the controls of the other State are effected;

(c) “adjoining State” means the other State;

(d) “officers” means persons responsible for policing and frontier controls who are under the command of the persons or authorities designated in accordance with Article 2(1);

(e) “rescue services” means the authorities and organisations whose functions are provided for in the emergency arrangements referred to in Part VII of this Protocol who are under the command of the persons or authorities designated in accordance with Article 2(1);

(g) “control zone” means the part of the territory of the host State determined by mutual agreement between the two Governments within which the officers of the adjoining State are empowered to effect controls;

(h) “restricted zone” means the part of the Fixed Link situated in each State subject to special protective security measures;

(i) “through trains” means trains travelling the Fixed Link but originating and terminating outside it, as opposed to “shuttle trains” which are trains travelling solely within the Fixed Link.