122.This section provides that having consulted appropriate persons, the Secretary of State must issue a code of practice. This is to set out the measures to be taken by persons (such as road hauliers) in operating a system to prevent clandestine entrants gaining entry to and travelling in their vehicles or other forms of transport. Subsection (4) of section 34 requires that reference be made to the code of practice issued under section 33 in order to determine what constitutes an effective system for preventing the carriage of clandestine entrants.