A trial judge must direct the jury on the permissible and impermissible uses of evidence of a course of sexual conduct where such evidence goes beyond the specific incidents charged; failure to do so renders the trial fatally flawed. The rule of practice requiring a corroboration warning for child witnesses applies to complainants aged 14 in sexual offence cases, and the rationale extends beyond cognitive limitations to the risk of irresponsibility of youth and motive for falsehood. A police officer who has reasonable grounds for suspecting a person of an offence ought to administer a caution before commencing a systematic interview, and the older test requiring a positive decision to arrest is insufficient in the context of modern recorded interview practices. Equivocal responses such as 'I don't remember' in a police interview do not amount to corroboration.
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