19.—(1) Subject to paragraphs (2) and (3) and to regulations 20 and 22(2), a residence permit must be renewed on application.
(2) On the occasion of the first renewal of a worker’s residence permit the validity may be limited to one year if the worker has been involuntarily unemployed in the United Kingdom for more than one year.
(3) In the case of a student whose first residence permit is limited to one year by virtue of regulation 18(5), renewal may be for periods limited to one year.