The Secretary of State may, at the request of any person and in consideration of such charges as he may determine, make arrangements—
for the provision at any control port of immigration officers or facilities in addition to those (if any) needed to provide a basic service at the port;
for the provision of immigration officers or facilities for dealing with passengers of a particular description or in particular circumstances.
"Control port" has the same meaning as in section 25.
"Facilities" includes equipment.
"Basic service" has such meaning as may be prescribed.