8 That a departure from an upper limit of three years for a single count of a crime against s172 in this case was appropriate can be seen by a comparison with the sentence imposed by the Court of Criminal Appeal in Inkson v R (supra). There the offender had pleaded guilty to causing grievous bodily harm by punching a passing stranger in the face twice without warning or provocation and causing him to fall to the ground where he struck his head on the roadway. The blows caused injuries to the mouth and nose, while the impact of the fall resulted in serious injury, which was life threatening, to the skull and brain. The offender then moved the unconscious victim onto the footpath and sat him against the adjoining wall, leaving him there. He was subsequently attacked by another person whose actions caused his death and who pleaded guilty to manslaughter. Inkson was 18 years of age, had never been in serious trouble and had good prospects of rehabilitation. His behaviour was quite out of character. His plea of guilty, however, was regarded by the court as one engendered by a recognition of the inevitability of conviction. One member of the court regarded the initial sentence of 4½ years' imprisonment as unattended by error, but the majority regarded it as excessive and reduced it to an effective one of 3 years' imprisonment. In the present case, the two appellants participated in an attack which lasted for some 20 minutes, did very serious injury to the victim's face and head and left him unconscious on a winter's night exposed to the elements. In his helpless condition as the result of the beating he received, he fell in the nearby river and suffered hypothermia. It was a much graver and more prolonged attack than that inflicted on the victim in Inkson. Both appellants were over 30 years of age and had long records which included offences of violence. In addition to numerous crimes of dishonesty and street offences, Rohan Mansell had a conviction for robbery with violence when he was still only 13 years old, and 13 prior convictions for assault, including one of 15 months' imprisonment for an assault in similar circumstances committed in late February 1998. Robert Mansell also had numerous convictions for dishonesty and street offences, one for causing grievous bodily harm in 1986 and convictions for rape, three assaults and wounding in respect of which he received a sentence of five years' imprisonment and he had been released from prison, having served it, less than 12 months earlier. There was no material in either case arguing for rehabilitative measures. Notwithstanding the plea of guilty by each, a sentence well in excess of that imposed on Inkson was fully justified.