“Now, the other matter is the effect of count 15 in relation to the other counts. A similar kind of principle applies to count 15, but the essential starting point before count 15 can have any influence on the other counts is that you would have to be sure that the defendant was guilty on count 15, in other words of those elements that he took the photographs and that the photographs were indecent. If you’re not sure of either of those elements, then count 15 cannot be used in any way in relation to any other count. So if you are sure that he took the photographs and that they are indecent photographs, then the prosecution argue that this evidence is relevant, because it establishes that the defendant has a propensity or a strong tendency to commit offences of the type with which you are concerned; that is, offences of a sexual nature directed towards young girls and these young girls in particular. If you agree with that, then the prosecution suggests it makes it more likely that the defendant committed the other offences on the indictment.”
“6. Evidence that a defendant collects or views child pornography is of course by itself evidence of the commission of a criminal offence. That offence is not itself one involving sexual assault or abuse or indeed any sexual activity which is prohibited. It is obvious that it does not necessarily follow that a person who enjoys viewing such pictures will act out in real life the kind of activity which is depicted in them by abusing children. It follows that the evidence of possession of such photographs is not evidence that the defendant has demonstrated a practice of committing offences of sexual abuse or assault. That, however, is not the question for the purposes of gateway (d). The question under gateway (d) is whether the evidence is relevant to an important matter in issue between the defence and the Crown. Is it relevant to demonstrate that the defendant has exhibited a sexual interest in children? 7. It seems to us that this is a commonsense question which must receive a commonsense answer. The commonsense answer is that such evidence can indeed be relevant. A sexual interest in small children or pre-pubescent girls or boys is a relatively unusual character trait. It may not be quite as unusual as it ought to be, but it is certainly not the norm. The case against a defendant who is charged with sexual abuse of children is that he has such an interest or character trait and then, additionally, that he has translated the interest into active abuse of a child. The evidence of his interest tends to prove the first part of the case. In ordinary language to show that he has a sexual interest in children does make it more likely that the allegation of the child complainant is true, rather than having coincidentally been made against someone who does not have that interest.
“8. The evidence with which we are dealing is evidence of propensity in the true sense of that word, by which we mean evidence of a character trait making it more likely that the defendant did indeed behave as charged. We are conscious that in the shorthand of the criminal courts the word "propensity" is sometimes applied, no doubt conveniently, to the case where there is evidence that the defendant has previously committed an offence similar to that which is now charged. Propensity may of course be proved by evidence of the previous commission of such an offence, and it may well be that that is the kind of propensity evidence most frequently adduced, but it is not limited to that kind of evidence. On the contrary, it may include any evidence that demonstrates that it is more likely that the defendant did indeed behave as he has been charged. It is however important that juries should be reminded that they cannot proceed directly from the possession of photographs to active sexual abuse. They must ask themselves whether this further step is proved so that they are sure. The exact direction will depend on the facts of each individual case. But it may be particularly important to remind the jury that the extra step does not follow and must be proved. ”