63 Procedure where competing request from State Party

(1) If section 61 applies and the requesting State is a party to the Statute, priority must be given to the request from the ICC if—
(a) the ICC has, under Article 18 or Article 19 of the Statute, made a deter‐ mination that the case in respect of which surrender is sought is admis‐ sible and that determination takes into account the investigation or pros‐ ecution conducted by the requesting State in respect of its request for extradition; or
(b) the ICC makes such a determination after receiving notification of the competing request.

(2) If the request is one to which subsection (1)(b) relates, then, pending the ICC’s determination,—
(a) the steps required to be taken under the Extradition Act 1999 in relation to a request for extradition may continue to be taken; but
(b) no person may be surrendered under that Act unless and until the ICC makes its decision on admissibility and determines that the case is inad‐ missible.