Lots

Lots of vicars do forget that an endowed church does not have any real civil obligations to the temporal side of the state, so that if there were any suggestions that gay weddings become mandatory or expected, the rites would have to be devised and this to go before synod. A discretion in any case is always granted to vicars - they do not have to marry drunks at the church or the impenitent or even royals if they are scruffy, so the same goes for other categories of person. Anyway from the point of view of the general theory of church and state, it is an endowed church not an established one.