8. The major premise of the appellant's primary submission was that the remissions pursuant to the Royal prerogative were of a different character to the ordinary remissions of sentence under the Prisons Act in that they were in the nature of a pardon and operated to cancel 205 days of the sentence imposed and to foreshorten the appellant's nominal term of imprisonment from ten years to nine years and 160 days (cf., as to the nature of a pardon, Reg. v. Foster (1984) 2 All ER 679, at pp 684ff.). That being so, it was said to follow from the reasoning underlying the decision in Blucher that the maximum parole period which the Board had been entitled to determine in the appellant's case was the balance of that foreshortened nominal term. Alternatively, it was argued that, if the nominal term of imprisonment had expired (cf. Whan v. McConaghy [1984] HCA 22; (1984) 58 ALJR 299, at pp 302,304), there was no power in the Parole Board either to revoke the order releasing the appellant on parole or to order that the appellant be returned to prison. In the Court of Appeal, Street C.J., in a closely reasoned judgment, rejected the major premise of this argument. His Honour held that the Royal prerogative remissions to which the appellant had become entitled were of a similar character to the ordinary remissions under the Prisons Act and operated not as a pro tanto pardon or as a foreshortening of the appellant's nominal sentence but as a foreshortening of the custodial period which he was required to serve under that sentence. There is obviously room for differences of opinion on the question whether, as a matter of legal theory, a remission should be seen as ordinarily partaking of the nature of a pardon or "forgiveness" (cf., e.g., A.T.H. Smith, "The Prerogative of Mercy, the Power of Pardon and Criminal Justice", (1983) Public Law 398, at pp.399,417ff., 424-425; R.F.V. Heuston, Essays in Constitutional Law, 2nd ed. (1964), pp 71-72; Re Royal Prerogative of Mercy upon Deportation Proceedings (1933) 2 DLR 348, at p 349) or as ordinarily involving no more than a release from the obligation to serve a nominal sentence which remains unaffected. In the view I take however, the outcome of the appeal to this Court does not depend either upon the answer to that question or upon the precise nature or effect of the particular Royal Visit remissions to which the present appellant became entitled. That being so, it is unnecessary to do more than indicate a tentative view that, whatever be the ordinary theoretical meaning of "pardon" or "remission", the Governor's powers under cl.IX of the Letters Patent Constituting the Office of Governor (New South Wales Parliamentary Handbook, 19th ed. (1972), Part III, p.4) to grant "a pardon, either free or subject to lawful conditions, or any remission of the sentence passed ... or any respite of the execution of such sentence" empower him to grant a release from the obligation to serve the nominal sentence while leaving it intact and that the express words of the actual remissions in the present case ("additional remissions", "extra remission", "operate in all cases so as to advance the date of the prisoner's release") and the provision for forfeiture plainly indicate that what was in fact granted was a "remission", in that limited sense, of the obligation to serve part of the sentence and not a cancellation or reduction of the nominal term of imprisonment.