the elephant in the room - i'll take one for the team...
of course the sudanese arms an even the english ones could all be antipope, as the mahdists were islamic, as were the gyptians, and even the english were anti-catholic. the king/queen of the UK cannot by law be catholic, and only in 2011 was a concession made that they could marry one. an islamic woman still cannot marry a non muslim, so all kinda antipapal. even if not made of antilope bits.