(By the way, Iain Duncan Smith and Charles Kennedy are both RC.. presumably they had harboured ambitions of being PM at some point... so to suggest you can't be Catholic and PM is guff).
For the uninitiated, here is a basic explanation of the tenets of Catholicism
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There used to be some ancient legislation that said PMs could not be Roman Catholic. It was all caught up in the Act of Settlement... the law (still in force) which says Royals cannot be Catholic or marry one, and still expect to inherit the throne.
It's been widely speculated that Blair was...