"If at a trial a person is charged with a sexual offence [which this was], then, except with the leave of the court -- (a) no evidence may be adduced, and (b) no question may be asked in cross-examination, by or on behalf of any accused at the trial, about any sexual behaviour of the complainant. (2) The court may give leave in relation to any evidence or question only on an application made by or on behalf of an accused, and may not give such leave unless it is satisfied -- (a) that subsection (3) or (5) applies, and (b) that a refusal of leave might have the result of rendering unsafe a conclusion of the jury or (as the case may be) the court on any relevant issue in the case. (3) This subsection applies if the evidence or question relates to a relevant issue in the case and either -- (a) that issue is not an issue of consent; or (b) it is an issue of consent and the sexual behaviour of the complainant to which the evidence or question relates is alleged to have taken place at or about the same time as the event which is the subject matter of the charge against the accused; or (c) is an issue of consent and the sexual behaviour of the complainant to which the evidence or question relates is alleged to have been, in any respect, so similar -- (i) to any sexual behaviour of the complainant which (according to evidence adduced or to be adduced by or on behalf of the accused) took place as part of the event which is the subject matter of the charge against the accused, or (ii) to any other sexual behaviour of the complainant which (according to such evidence) took place at or about the same time as that event that the similarity cannot be reasonably be explained as a coincidence."