[13] In determining this question, the learned trial judge formed an adverse view of Parker's credit. Parker had sworn that he would not witness a borrower's signature in any circumstances. He was later obliged to concede that he had done so on two identified occasions. His Honour also expressed general dissatisfaction with Parker as a witness, describing him as evasive and disingenuous and rejecting his own explanation that he was naïve. It may be assumed that these last were findings based, in part, on his Honour's observations of Parker when he gave evidence. The appellants conceded that, by reason of these matters, his Honour was entitled to form an adverse view of Parker's credibility. Up to a point that is so, given the advantage which, this Court must concede, his Honour had in observing Parker giving evidence. But it by no means follows, and the appellants dispute, that Parker was involved, by wilful abstention from inquiry, in the fraud perpetrated on the first respondent. There are other equally credible explanations for Parker's poor performance as a witness.