“Everything depends on the directions and facts of a particular case, and the danger that the jury might seek to use the evidence of one complainant as evidence of his guilt on counts concerned only with another complainant.”
“The particular ways in which evidence that a person has committed one offence may or may not be relevant in deciding whether that person is guilty of another offence are not always immediately obvious even to legal professionals and have had to be worked out by the courts in a number of cases. Lay jurors are entitled to assistance on these questions and cannot be expected to work out the approach which the courts regard as proper for themselves”