"24. The appropriate length of the custodial sentence, or of the total custodial sentence in a case involving more than one offence, will depend on the seriousness of the offending. We have been referred by counsel to the sentences in a number of cases involving multiple serious sexual offences: R v Watkins[2014] EWCA Crim 1956 ,[2015] 1 Cr App R (S) 6 ; R v DJ[2015] EWCA Crim 563 ,[2015] 2 Cr App R (S) 16 ; R v Leighton[2017] EWCA Crim 2057 ; R v Falder[2018] EWCA Crim 2514 ,[2019] 1 Cr App R (S) 46 ; AG's Reference, JRM[2021] EWCA Crim 524 ; and AG's Reference, R v Wilson[2021] EWCA Crim 839 . The facts and circumstances of cases inevitably differ. The assistance to be gained by comparing sentences in other cases is therefore limited. Those cases show, however, that it will be comparatively rare for the total custodial term of an extended sentence for multiple sexual offences to exceed about 30 years after a trial. Sentences of greater length have been reserved for particularly serious offending. 25. In R v McCann, Sinaga and Shah[2020] EWCA Crim 1676 , [2021] 4 WLR McCann and Sinaga, two unconnected prolific sexual offenders, had received life sentences with minimum terms of 30 years. HM Attorney General submitted that their sentences should be increased to whole life tariffs. The court held, at [89], that a discretionary life sentence should only be imposed with a whole life tariff in wholly exceptional circumstances. It found, however, that each of the cases was within the category of the most serious cases of multiple rapes and merited a notional determinate term of 60 years. The court therefore increased the minimum term in each case to 40 years. 26. In AG's Reference, JRM, an exceptional case involving about 150 rapes, the court concluded that the appropriate total sentence after trial would have approached 60 years. 27. However, the court in Wilson rejected at [45] a submission that the decisions in McCann, Sinaga and AG's Reference, JRM mandated a higher level of sentencing than would previously have been considered appropriate. It held that those cases were not intended to set a new benchmark, or to initiate a general increase in the levels of sentencing for offenders convicted of multiple sexual offences, where the offending fell below the level of exceptional seriousness illustrated by those cases." (Emphasis added)