There's just two things wrong with your post. First, you can't pass a law saying "this law can't be repealed" - it's unconstitutional (and, as others have noted, a terrible idea - sure it's great to "lock in freedom", but what's to stop them "locking in tyranny" through the same mechanism?). You would have to do it through a constitutional amendment which is much harder to get though (and even that can, in turn, be changed by a later amendment).
Second, there's nothing "rogue" about this minister. He has the full support of the Prime Minister in his actions.
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There's just two things wrong with your post. First, you can't pass a law saying "this law can't be repealed" - it's unconstitutional (and, as others have noted, a terrible idea - sure it's great to "lock in freedom", but what's to stop them "locking in tyranny" through the same mechanism?). You would have to do it through a constitutional amendment which is much harder to get though (and even that can, in turn, be changed by a later amendment).
Second, there's nothing "rogue" about this minister. He has the full support of the Prime Minister in his actions.