Peter K neither I nor the guest or guests I was debating with give a fuck about Charles's position as head of the CofE, he [guest] is an American and I am a Scot so it probably does not affect either of us, I know it means sod all to me. Charles was being criticised for being a rich over priveleged parasite, not for apostasy or anything like it. While your no doubt erudite exposition of the position vis-a-vis Charles and the church is correct, it was not the basis of the discussion. So whether under our unwritten constitution Charles could take up the tile of 'Defender of the Faith' or not, has no bearing on whether I think he has the right as a human being to marry CP-B.
Giok