The 1987 Synod motion and Issues in Human Sexuality are the two authoritative Church of England statements on the issue of homosexuality.
As a member of the Anglican Communion, the Church of England also respects the teaching of Resolution 1.10 on Human Sexuality of the 1998 Lambeth Conference (the ten-yearly meeting of all bishops of the Communion) which expresses the declared mind of the Anglican Communion as a whole.