Within the last 40 years it has been possible for people to undergo sex reassignment surgery. British law was changed ten years ago to enable them to change the sex given on their birth certificates. What challenges do these developments throw up for Christian thought and practice? Ernie is joined by Rev Rachel Mann, a transgender priest in the Church of England, Dr Vicky Gunn who teaches practical theology at Glasgow University and Dr Don Horrocks, head of public affairs at the Evangelical Alliance and Research Associate at the London School of Theology.