s 145 Service of sentence in territory executing Part 3 warrant
(1) This section applies if— (a) a Part 3 warrant is issued in respect of a person; (b) the certificate contained in the warrant certifies that a sentence has been imposed; (c) an undertaking is given on behalf of a category 1 territory that the person will be required to serve the sentence in the territory; (d) on the basis of the undertaking the person is not extradited to the United Kingdom from the category 1 territory. (2) The sentence for the offence must be treated as served but the person’s conviction for the offence must be treated as a conviction for all other purposes.