I call BS on the three days before wedding.
Such and obvious lie. Does she think we are stupid ? Married by the Archbishop of Canterbury, no less. 'So she called him and said, look....
...Also, Marriage certs (along with birth and death certs) are public records. So the date has been recorded. Would the Archbishop of Canterbury really have gone along with the charade ?
Two ceremonies are actually quite normal in some European countries, and it's quite possible they did this: but NOT with the Archbishop! The first ceremony is the legal one, and is quite quick and impersonal. Just the signing of the papers, the legal commitment etc.
Followed by the church ceremony which can by days, weeks, months later, without any legal registration, signing of papers, etc. It's the blessing, the exchange of vows, and is far more personal. In Germany you HAVE to have two weddings, in fact. (Or just one, the legal one.)
My daughter in Ireland also had two weddings, a quiet legal one in March, and a church one the following August. The legal one always comes first.
I think it's possible they did this, but definitely the AofC wouldn't have let himself be ordered to do it, and it wouldn't even have been possible.