"Accordingly, the present case was one where the requirement of a fair trial required a strong warning to the jury of the potential for error in the complainant's testimony. The jury should have been warned that, in evaluating her evidence, they had to bear in mind that it was uncorroborated, that over twenty years had elapsed since the last of the alleged offences occurred, that experience has shown that human recollection, and particularly the recollection of events occurring in childhood, is frequently erroneous and liable to distortion by reason of various factors, that the likelihood of error increases with delay, that the complainant had testified concerning incidents occurring to her as a young child after she had awoken and pretended to be asleep, that no complaint was made to her mother, and that, by reason of the delay and lack of specificity as to the dates, the defence was unable to examine the circumstances of the alleged offences. To what extent these matters needed elaboration or a consequential warning that it would be unsafe to convict on such uncorroborated evidence was very much a matter for the trial judge."