23. (1) A sentenced person may be transferred to an executing state in accordance with a transfer warrant before the expiry of—

(a) the period of 30 days from the date on which the Minister has been notified by the competent authority of the executing state of the decision by that competent authority to recognise the judgment, or

(b) where subsection (2) applies, the period of 10 days from the revised date referred to in that subsection.

(2) Where, due to exceptional circumstances, a transfer does not occur within the period specified in subsection (1)(a), the Minister and the competent authority of the executing state shall agree a revised date which shall be as soon as possible after the cessation of the exceptional circumstances.