In this Chapter “prisoner custody officer” means a person in respect of whom a certificate is for the time being in force certifying—
that he has been approved by the Secretary of State for the purpose of performing escort functions; and
that he is accordingly authorised to perform them.
Schedule 7 to this Act shall have effect with respect to the certification of prisoner custody officers.
In this section and Schedule 7 to this Act “escort functions” means the functions specified in section 118(1) above.