Lords Spiritual (Women) Act 2015 in the context of "Diocese of London"

The House of Lords Act 1999 (c. 34) is an act of the Parliament of the United Kingdom which reformed the House of Lords, one of the chambers of Parliament. The Act was given royal assent on 11 November 1999. For centuries, the House of Lords had included several hundred members who inherited their seats (hereditary peers); the Act removed such a right. However, as part of a compromise, the Act allowed ninety-two hereditary peers to remain in the House. Another ten were created life peers to enable them to remain in the House.

The Act decreased the membership of the House from 1,330 in October 1999 to 669 in March 2000. As another result of the Act, the majority of the Lords were thence life peers, whose numbers had been gradually increasing since the Life Peerages Act 1958. As of June 2023, there were 825 members of the House of Lords, of whom 24 were senior Church of England bishops, whose representation in the House is governed by the Lords Spiritual (Women) Act 2015.

The Lords Spiritual are the twenty-six bishops of the Church of England who sit in the House of Lords of the Parliament of the United Kingdom.

The archbishop of Canterbury, archbishop of York, and the bishops of London, Durham, and Winchester are always Lords Spiritual. The remaining twenty-one Lords Spiritual are typically appointed based on length of service alone, however the Lords Spiritual (Women) Act 2015, which is in force until 2030, gives female bishops priority in appointments. When a vacancy arises, if a woman is eligible to become a Lord Spiritual then she must be appointed, and if more than one woman is eligible then the appointment is decided on length of service.