Subject to the provisions of this section, in any case where a person who is not less than 16 but under 21 years of age is convicted of an offence punishable with imprisonment, and the court has been notified by the Secretary of State that a detention centre is available for the reception from that court of persons of his class or description, it may pass on him a sentence of detention in that centre for a fixed term of three months.

A court shall not pass a sentence under this section in the case of a person who has served or is serving a sentence involving his detention for two months or more in a prison or in a young offenders institution or a sentence of Borstal training, or in the case of a person who has served a sentence of detention in a detention centre, unless the court is of the opinion that, having regard to special considerations arising out of the circumstances of the case and the character of the offender, this method of dealing with him is the most appropriate.

Where it appears to the Secretary of State that a person detained in a detention centre is unfit for such detention by reason of his health, without prejudice to any other powers he may have in the matter, he may, after consultation where practicable with the judge by whom or the presiding chairman of the court by which the sentence was passed, release that person; and he shall then be required to be under supervision in accordance with section 11(1) of the M1Criminal Justice (Scotland) Act 1963.