In response to the Home Office recommendations contained in Speaking Up for Justice (1998) the Youth Justice and Criminal Evidence Act (YJCEA) 1999 introduced a new regime for the conduct of sexual offence trials. Section 41 of the Act, which came into force on 4 December 2000, brings about dramatic changes to the rules on the admissibility of evidence of complainants' sexual behaviour, severely restricting the discretion of trial judges to introduce such evidence or to allow questioning concerning it. This represents a radical new departure that will fundamentally affect an accused's position at trial. Responses to section 41 have predictably been divided given the extremely sensitive nature of this area of the law of evidence and the complex set of social and political issues which are at stake. Many have greeted it as a long overdue reform of a system premised upon outmoded and sexist beliefs concerning women's sexual behaviour which has routinely functioned to admit prejudicial and irrelevant evidence. Others, predominantly within the legal profession, have expressed serious concerns over whether the new law is workable and the extent to which, by potentially excluding critically relevant evidence, it may infringe upon a defendant's right to a fair trial. The quality of the legislation is soon to be tested. On 26 and 27 March 2001 the House of Lords heard an interlocutory appeal in the case of R v. A and were asked to decide if the new provisions, by excluding previous sexual history evidence between the complainant and the defendant, contravened Article 6 of the European Convention of Human Rights. Their Lordships are, at the time of writing, yet to give judgment and the fate of the defendant in question, and several others whose trials have been postponed pending their decision, hangs in the balance. This article seeks to show that the new Act, despite being well-intentioned, does not adopt a coherent or sustainable approach to the relevance of previous sexual history evidence and the restrictive nature of its provisions are such that genuinely relevant material will be rendered inadmissible. This creates the risk of disembodying the case before the jury and raises the significant possibility that miscarriages of justice will occur. As a consequence, unless the legislation can be read down in such a way as to reintroduce a measure of judicial discretion to admit such evidence, a declaration of incompatibility may be called for.