13.—(1) Subject to paragraphs (2) and (3) and article 16(1), a residence permit shall 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 residence permit is limited to one year by virtue of article 12(5), renewal may be for periods limited to one year.