2. In this Order, “the deposited map” means the set of maps, numbered 1 and 2, marked “Map referred to in the Sunderland (Hylton Riverside and Southwick) Enterprise Zone (Designation) Order 1990” prepared in duplicate and signed by an Under Secretary in the Department of the Environment, of which one duplicate has been deposited and is available for inspection at the principal offices of the Tyne and Wear Development Corporation and the other duplicate has been deposited and is available for inspection at the offices of the Secretary of State for the Environment.