When Mr Onions came to give evidence at the committal in 1994 and the trial in 1996 he gave a description of the vehicle in which he had been given a lift which contained more detail than the description he had given at the Bowral Police Station in 1990, and which, in one respect, did not match the appellant's vehicle. Mr Onions said, in his evidence, that the vehicle had a wheel attached vertically at the rear. Many Nissan 4 WD vehicles have such a spare wheel, but it was shown that the appellant's did not have one in January 1990, although one was fitted later. A similar statement about the vehicle was also made by the rather terrified woman into whose car Mr Onions had jumped. The jury were entitled to take the view that this evidence, of Mr Onions and the woman, was mistaken. Indeed, what may have been at work is an example of the well known displacement effect about which trial judges commonly warn juries in relation to photographic identification. This matter did not emerge as an issue until the defence case. In his evidence in chief, Mr Onions gave a description of the vehicle which included a slightly ambiguous reference to a spare wheel at the rear. He was shown by the Crown Prosecutor, without objection, and in a leading fashion, photographs of a silver Nissan 4 WD with a vertically mounted spare wheel at the rear, and he said the vehicle looked like the one in the photographs. No particular issue was made about the subject while he was in the witness box. When the appellant came to give evidence he proved that in January 1990 his silver Nissan 4 WD did not have a vertically mounted spare wheel at the rear, although it had a spare tyre underneath the rear. A vertically mounted spare wheel was attached to the rear later, but it was not there on 25 January 1990. This raised a factual problem for the jury to consider. What was indisputable, however, was that in January 1990 Mr Onions described to the police a man with a moustache like Merv Hughes, who attributed to himself personal characteristics which matched those of the appellant. Four years later, Mr Onions' shirt was found next to the appellant's shirt. (Having regard to the nature of the case which was ultimately advanced on behalf of the defence, it may be noted that there was no positive evidence that any other member of the Milat family had a moustache which resembled that worn by Merv Hughes, although at p1526 and p1531 of the transcript there is evidence of Richard Milat which could have been regarded as raising such a possibility).