What does the Church of England's doctrine say about issues of sexual identity and practice?

Like almost all churches, the Church of England and even more the wider Anglican Communion is struggling to come to terms with the vocal and growing minority of, in their own terms, "non-heteronormative" people, within the church as well as within the wider society. This concerns gender-fluidity/changes as well as homosexuality. The issue is contentious within and between the congregations. This question is motivated by [another question](https://christianity.stackexchange.com/questions/104499/how-can-anglican-clergy-be-suspended-without-pay-for-teaching-what-the-anglica?noredirect=1#comment300641_104499) : What should an Anglican priest do who cannot in good conscience represent the more libertarian stance of their church regarding the fairly broad complex of sexual identity, gender fluidity, homosexuality etc. In one specific case cited, a priest was put on leave after opposing in a sermon what he perceived as LGBT indoctrination bordering on coercion by a sexual education charity at a primary school. The OP of that question perceived a mismatch between the more conservative official doctrine of the Church as opposed to their more libertarian actions. The question claimed that the priest was "upholding the Church of England’s doctrinal stance". I tried to find out what that official stance might be. There is a long Wikipedia page about the wider Anglican community's [struggle to deal with homosexuality](https://en.wikipedia.org/wiki/Homosexuality_and_the_Anglican_Communion) , and it is clear that the *factual* opinion spectrum, even just on this relatively narrow topic, is very wide. But what is the *official* doctrine? I read passages of the [Book of Common Prayer](https://www.churchofengland.org/prayer-and-worship/worship-texts-and-resources/book-common-prayer) , "a key source for its doctrine": - The [ordination vow](https://www.churchofengland.org/prayer-and-worship/worship-texts-and-resources/book-common-prayer/ordaining-and-consecrating-0) did not seem to contain anything that directly would compel a priest to oppose LGBT... advertising. - There is a [enumerated list of relatives that must not marry](https://www.churchofengland.org/prayer-and-worship/worship-texts-and-resources/book-common-prayer/table-kindred-and-affinity) ; homosexuality is not mentioned there, most likely because it didn't cross anybody's mind. - [The Form of Solemnization of Matrimony](https://www.churchofengland.org/prayer-and-worship/worship-texts-and-resources/book-common-prayer/form-solemnization-matrimony) talks about man and woman respectively husband and wife throughout. Whether the absence of same-sex marriage is to be taken as a prohibition or whether it simply didn't cross anybody's mind is, I suppose, up to debate. Is there more in the official, binding doctrine that would compel a priest to resist his superiors in LGBT... issues as a matter of doctrinal principle?