“References in this Chapter of evidence of a person’s “bad character” are to evidence of, or of a disposition towards, misconduct on his part, other than evidence which- has to do with the alleged facts of the offence with which the defendant is charged, or is evidence of misconduct in connection with the investigation or prosecution of that offence?”
“(1) in criminal proceedings evidence of the defendant’s bad character is admissible if, but only if—” (a) all parties to the proceedings agree to the evidence being admissible, (b) the evidence is adduced by the defendant himself or is given in answer to a question asked by him in cross-examination and intended to elicit it, (c) it is important explanatory evidence, (d) it is relevant to an important matter in issue between the defendant and the prosecution, (e) it has substantial probative value in relation to an important matter in issue between the defendant and a co-defendant, (f) it is evidence to correct a false impression given by the defendant, or (g) the defendant has made an attack on another person’s character. …. (3) The court must not admit evidence under subsection (1) (d) or (g) if, on an application by the defendant to exclude it, it appears to the court that the admission of the evidence would have such an adverse effect on the fairness of the proceedings that the court ought not to admit it. (4) On an application to exclude evidence under subsection (3) the court must have regard, in particular, to the length of time between the matters to which that evidence relates and the matters which form the subject of the offence charged.”
"If the jury is told in simple language and with reference, where appropriate, to the particular facts of the case, why the bad character evidence may be relevant, this will necessarily encompass the gateway by which the evidence was admitted. …. It is of course highly desirable that the jury should be warned against attaching too much weight to bad character evidence let alone concluding that the defendant is guilty simply because of his bad character."