140 Mr Logan explains this difference on the basis that he was better "instructed" in February 2001 than he was in 1996, and he had more reliable and extensive market information. His better instructions seem to have been a full briefing by the plaintiff's solicitors on traffic engineering, zoning and planning issues. He also had a general discussion with Mr McMahon before undertaking his valuation in 2001. While traffic, engineering, zoning and planning issues may have had a relevance to other aspects of Mr Logan's valuation - as he also dealt extensively with other issues such as injurious affection - it does not appear from his evidence that these issues were of any particular relevance to his appreciation of comparable sales. What is apparent, in my finding, is that Mr Logan came to a markedly enhanced appreciation of the location of Lot 116 and of the value of its exposure particularly to Loftus Street traffic. The issue of location caused him, like Mr McMahon, to see much significance in the West Perth address and to place new weight on that, which in turn led to reliance on sales in West Perth to the south of the Fremantle suburban railway and also the Southport/Harrogate area. Mr Logan also suggested that in 1996 he had placed what he now regarded as too much reliance on sales identified to him by valuers in the Valuer General's office, or other valuers retained by government agencies, sales which he now considered not truly reflective of the location and exposure of Lot 116 and he had not then had adequate regard to other sales such as those now relied on. This evidence does not satisfactorily explain, in my view, the fact that some 18 months before the relevant date Mr Logan was satisfied at the comparability of the sales he then used, with what he then saw to be appropriate adjustments for factors including location and exposure, but approaching three years after the relevant date he had formed quite a different appreciation of the sales which are comparable and this has produced a somewhat dramatically different market value for Lot 116 as at 1 May 1998. In this change, it is probable in my finding that the influence, conscious or unconscious, of Mr McMahon has played a part. The other change, of course, is that in February 2001 Mr Logan had access to and has relied on sales information from 1999 and 2000 and also, inevitably, now has the benefit of much hindsight, in my finding, too much hindsight, into trends, developments and market movements from May 1998 to February 2001. In my findings these factors have had a perhaps unconscious but nevertheless inappropriate and improper influence on Mr Logan's present opinion, an influence which unduly favours the plaintiff.