Moved by Duffy's new book, I went to look at some medals in the B Mus; not least the one Duffy reproduces showing Anglia supplex being raised up by a beneficent Roman Pontiff.
There is another medal nearby, presumably dating from before the Spanish Marriage since Good Queen Mary is shown alone and without any Hapsburg titles. But she does have the title Fidei Defensatrix.
Was the statute by which Henry Tudor secured Fidei Defensor to himself after the breach with Rome still on the statute books? Did Mary continue too use it? Was Elizabeth ever Defensatrix, or did she go for the unisex Defensor?
That's just the sort of information Professor Tighe would have at his fingertips.