“If the judge had erroneously referred to section 85 of the 2000 Act, counsel would have been likely to have drawn attention to the fact that the extended sentence could not be imposed under that Act either at the time of sentencing or within the time permitted under the slip rule. Alternatively, if the claimant had considered the sentence to have been unlawfully imposed he could have sought permission to appeal to the Court of Appeal (Criminal Division). He did not do so.”
“The critical importance of the warrant and what detention it actually commands and authorises applies both ways as illustrated by the judgment in Demer v Cook(1903) 88 LT 629 . Lord Alverstone CJ contrasted two situations. One was where the gaoler receives a prisoner under a warrant which is correct in form in which case no action will lie against him if it should turn out that the warrant was improperly issued or the court had no jurisdiction to issue it. The other was where the warrant had on its face expired or the gaoler has received the prisoner without any warrant, in which case the action will lie: ‘the warrant and nothing else is the protection to the gaoler, and he is not entitled to question it or go behind it’: p 631.”
“121 From those authorities it is possible to draw the following principles: (i) The early release arrangements do not affect the judge’s sentencing decision. (ii)Article 5 of the Convention does not guarantee a prisoner’s right to early release. (iii) The lawfulness of a prisoner’s detention is decided, for the duration of the whole sentence, by the court which sentenced him to the term of imprisonment. (iv) The sentence of the trial court satisfies article 5.1 throughout the term imposed, not only in relation to the initial period of detention but also in relation to revocation and recall. (v) The fact that a prisoner may expect to be released on licence before the end of the sentence does not affect the analysis that the original sentence provides legal authority for detention throughout the term. 122 In our judgment those principles are not affected by the decision in Del Rio Prada 58 EHRR 37. Del Rio Prada does not detract from the core distinction between sentence passed by the sentencing judge and the administration of execution of the sentence. Throughout the relevant period, the governing authority for the detention is the original sentence. It is entirely foreseeable (if necessary with appropriate legal advice) that during the currency of a determinate sentence, which was calculated and imposed without account being taken of the possibility of early release, the arrangements for the execution of the sentence might be changed by policy or legislation. Accordingly, the lawfulness of the sentence was not undermined of compromised by changes of the sort made by the 2020 Act.”