I particularly like this comment:
Vince Cable is the Liberals’ Treasury or economic spokesman, but he’s certainly not anyone’s Shadow Chancellor. If he were, then that makes Bob Spink UKIP’s Shadow Chancellor, Shadow Transport Secretary and Leader of the UKIP Opposition. Which would be just as (but no more) silly.There may have been many Anti-Popes throughout history but that didn't make any of them a Pope. Just as the Anti-Shadow Cabinet is not a Shadow Cabinet.