In the coming months, the General Synod and then the diocesan synods will be considering legislation enabling bishops of the Church of England to ordain women to the office of priest, and making related provisions as to the manner and effect of this change in the law and practice of the Church of England. The purpose of this article is not to examine that draft legislation, which at the time of writing is still being subjected to line-by-line scrutiny in a Revision Committee of the General Synod, but to sketch in some of the legal background against which it was prepared. In particular, there is a fundamental issue: why is legislation needed? To which may be added: why is Parliamentary authority, expressed by the approval of a Measure, required for any necessary change in the Canons?